Updated January 15, 2026

TL;DR: Outsourced sales teams managing 3-10+ client domains need separate 30-day warmup schedules for each. Start with 2 emails on Day 1, ramp to 30-40 daily by Day 30, and maintain a 1:1 warmup-to-campaign ratio after Day 14. We give you unlimited email warmup through a private network of 4.2M+ accounts. Keep bounce rates under 2%, spam complaints below 0.1%, and inbox placement above 83.1%. Never stop warmup after Day 30, continuous warmup protects client domains long-term.

If you run an agency and manage cold outreach for multiple clients, you already know the stakes. One burned domain costs you weeks of setup time, damages client trust, and can tank an entire campaign before it starts. The challenge is clear: you need to scale across 3, 5, or 10+ client domains while keeping every inbox healthy and every message landing in the primary folder.

I've seen firsthand how email deliverability challenges multiply for agencies. Marketers, salespeople, and event staff often don't understand how their actions affect sender reputation, causing hard bounces from poorly captured addresses and domain damage from shadow marketing programs. Business domains face stricter filtering than consumer Gmail because corporate security tools like Mimecast, Barracuda, and Proofpoint prioritize blocking over delivery.

The 30-day warmup plan below gives you a repeatable system to warm new domains, introduce campaign emails safely, and maintain sender reputation across your entire client portfolio.

Why outsourced sales teams face harder deliverability challenges

Multiple client infrastructure creates coordination friction

Outsourced agencies must create multiple lookalike domains with proper DKIM, DMARC, MX, and SPF configuration, then spread volume across 3+ domains to avoid overloading any single one. You manage this setup for each client engagement, requiring DNS coordination through client IT departments when you often lack direct access.

The operational difference is measurable. In-house teams warm one domain with direct IT access, typically completing DNS setup in 2-4 hours. Outsourced teams often repeat this process across multiple domains per client, which can introduce delays due to DNS ticket approval and propagation. Agencies managing multiple client infrastructures require dedicated deliverability specialists to monitor reputation variance across that infrastructure.

"I run cold outreach with multiple DFY domains/inboxes, and Instantly's team actually carried me through a messy situation end-to-end. After a Google sweep hit several DFY domains, support ... replaced the affected domains at no cost, confirmed I should re-warm the new inboxes, and later restored 25 deleted accounts..." - Verified user review of Instantly

B2B corporate filtering hits harder than consumer Gmail

B2B list quality faces unique challenges from new contacts, temporary contacts, shifting responsibilities among team members, and role turnover. Meanwhile, common business filtering providers include Mimecast, Barracuda, and Proofpoint, plus Google Workspace and Outlook 365 which apply the same filtering engine used in consumer mail.

The performance gap shows in the data. Gmail shows higher inbox placement rates than the global average, while Outlook generally trails other major providers. Since B2B recipients overwhelmingly use Outlook in corporate environments, outsourced teams targeting enterprise accounts face stricter filtering by default.

Reputation fragmentation requires systematic monitoring

When sales team members get their own ESP accounts to nurture leads separately, their spam complaints harm both website domain reputation and sender IP reputation. For agencies juggling multiple client workspaces, this fragmentation multiplies, one misconfigured domain or one bad list creates a support fire that pulls attention from healthy campaigns.

High-volume agencies sending millions of emails monthly require dedicated monitoring dashboards, automated blacklist alerts, and clear escalation protocols for deliverability issues. Without that infrastructure, agencies risk discovering problems only when clients report zero replies.

The business cost of skipping warmup

Email deliverability directly drives pipeline generation for B2B sales and marketing teams. Nearly half (45%) of global email traffic gets categorized as spam, costing businesses millions in lost opportunities.

The recovery timeline is harsh. Because sending reputation is tracked every 30 days, it could take 4 or more weeks to rebuild it and every day you get blocked can cost you. When email deliverability drops below 90%, organizations can lose thousands in pipeline each month.

"I love that Instantly lets me reach the right people directly. With Facebook ads I was only getting 'gmail' type leads and zero replies. With Instantly, I can contact CEOs, founders, and managers ... and they actually reply and show interest..." - Verified user review of Instantly

Technical prerequisites before Day 1

DNS authentication records (non-negotiable)

SPF, DKIM, and DMARC authenticate your mail server and prove to ISPs, mail services, and receiving mail servers that senders are truly authorized to send email. To get inbox placement above 83%, you need all three records configured correctly and verified before you start warmup.

SPF record setup:

I recommend your SPF record include all legitimate sending sources while staying under the 10 DNS lookup limit. Verify all authorized sending sources and stay under 10 DNS lookups to avoid permerror. Record syntax typically looks like:

v=spf1 include:_spf.google.com ~all

Use ~all for soft fail (recommended during warmup) or -all for stricter enforcement after you reach production volume.

DKIM configuration:

You need to navigate to Google's Admin console and enable Authenticate email, then access your domain's DNS settings to add the DKIM TXT record. Key length requirements are typically 1024-bit or 2048-bit keys. Verify DKIM record format and placement in DNS, and ensure DKIM signature domain aligns with the From domain.

DMARC policy implementation:

Before you begin setting up DMARC, you MUST have your SPF and DKIM setup properly and working. DMARC works in conjunction with SPF and DKIM, so DKIM and SPF should be authenticating messages for at least 48 hours prior to establishing this record.

Start with p=none (monitoring only), then move to p=quarantine after analyzing reports for a few weeks. Finally, switch to p=reject once you have stable metrics. DMARC policy enforcement tells receiving servers what to do when authentication fails, start permissive and tighten only after your reputation is established.

Custom tracking domain configuration

I strongly recommend you never send cold emails from your primary domain. Instead, set up a subdomain from which to send your marketing emails. Each subdomain you create has its own reputation, adding a layer of protection for your root domain.

Setting up a custom tracking domain uses your specified domain for tracking code insertion, making it unique and isolating your sending reputation and deliverability from other accounts. For more setup guidance, review our guide on scaling with secondary sending domains.

Domain age and existing reputation check

Use MXToolbox for DNS record validation and Google Postmaster Tools to monitor email deliverability metrics and visualize your emails' performance. Check your domain for existing blacklist listings before starting warmup, cleaning up a blacklisted domain takes weeks and should be done before you invest time in warmup.

For agencies managing multiple clients, review outreach history, database quality, templates, assess domain health, uncover risks, configure DNS, create mailboxes, and carefully warm them up with small batches before scaling. This audit process prevents you from warming a domain that already has reputation damage.

The 30-day warmup plan: Week-by-week breakdown

Week 1 (Days 1-7): Foundation phase

Start with minimal volume to establish positive sending patterns. Your first week builds the foundation ISPs use to classify your domain. Here's your daily progression:

Send warmup emails only during Week 1. No campaign emails, no exceptions.

Our slow ramp warmup sends 2 emails on Day 1, 4 emails on Day 2, 6 emails on Day 3, and so on, gradually increasing warmup emails naturally to protect domain and account deliverability.

Day 7 checkpoint:

Run these three critical tests on Day 7. First, test your spam score using a tool like Mail-Tester. Second, verify bounce rates stay under 2% in your dashboard. Third, confirm no blacklist listings appear using MXToolbox. If any test fails, reduce volume by 50%, audit your content and authentication setup, then retest in 3 days before proceeding.

"I love the automation features of Instantly, especially the automatic email scheduling. It saves me time by sending emails at optimal times, reducing the chances of them being marked as spam. The setup was very easy and straightforward." - Verified user review of Instantly

Week 2 (Days 8-14): Ramp-up phase

Increase your sending volume by 10-20 daily emails every week. During this phase, continue warmup-only emails while ISPs observe your sending patterns and engagement rates.

Daily progression:

Domain age adjustment:

Adjust your ramp speed based on domain age. Accounts less than six months old should cap warmup at 30 emails per day after ramp-up with 1-email daily increments. Older domains can push to 40 emails per day with 2-email increments.

Day 14 checkpoint:

Run an inbox placement test using a service like GlockApps, verify open rates exceed 20% and bounce rates stay under 2%, and check domain reputation in Google Postmaster Tools. Do not send any real campaigns during the initial warmup phase, but if you absolutely must start before completion, begin with low volume and increase slightly every week.

For a visual walkthrough of warmup settings, watch this Instantly AI Email Warm Up tutorial that covers the setup process step-by-step.

Week 3 (Days 15-21): Campaign introduction phase

After completing the initial 14-day warmup-only period, you can introduce campaign emails while maintaining warmup to protect sender reputation. Maintain a good ratio of warmup to campaign emails for example, 30 warmup emails and 30 campaign emails per day, keeping total daily emails (warmup + campaign) to a maximum of 60 per email account.

Daily progression with 1:1 ratio:

Day 21 decision tree:

Monitor bounce rates and spam complaint rates closely. If you're seeing behavior that suggests deliverability is suffering, decrease your volume by 25-30% until metrics begin to normalize. If all metrics pass (bounce <2%, spam <0.1%, placement >85%), continue to Day 30 as planned.

We can handle large scale email campaigns without worrying about deliverability, with automation for inbox rotation, warmup, and sending limits making outreach smooth and saving manual work.

"Unlimited Email inbox warmup is included with all the plans, and you get access to the Unibox at all plans too. This saves a ton of time." - Verified user review of Instantly

Week 4 (Days 22-30): Production ramp phase

Continue the 1:1 warmup-to-campaign ratio while gradually approaching your target production volume. I recommend you not send more than 40 emails/day per email account and 120 emails/day across the entire sending domain, including both warmup and outreach emails.

Daily progression:

Day 30 production certification:

All metrics must pass to certify production-ready status. Target an acceptable deliverability rate around 95% of successful deliveries, with bounce rate not exceeding 3%.

Required thresholds:

Additionally, confirm domain health shows 100% in monitoring tools, metrics remain stable within 10% variance over 7 days, and you've completed a full 30-day cycle.

For detailed deliverability fundamentals, watch The Ultimate Guide to Cold Email Deliverability in 2025 from our official channel.

How we protect your agency infrastructure with unlimited warmup

Private deliverability network at scale

We built a private network of 4.2M+ accounts to guarantee safe, effective deliverability for your sending accounts. Our warmup system uses headless browsers to generate opens and thoughtful replies from real inboxes, signaling legitimacy to ISPs.

The warmup functionality mimics human conversations between email accounts. Your "friends" are other users who enabled warmup, ensuring all warmup emails receive opens and high-percentage thoughtful replies with positive sentiment.

Configuration options for agency workflows

We give you full control over warmup parameters for each client workspace. Navigate to the Email Accounts tab, click on the email account you want to edit, select Settings in the pop-up window, and scroll down to Warmup settings.

Key settings available:

1. Increase by day: Once enabled, warmup starts sending 1 warmup email on the first day and increases by 1 email per day until it reaches your set maximum limit by default
2. Warmup filter tag: Use the default warmup filter tag or customize it to filter out warmup emails from your primary inbox, the "Generate random" button creates a random tag
3. Warm custom tracking domain: Include your custom tracking domain in your warmup emails to improve deliverability
4. Read emulation: Enabling read emulation makes the system spend time and scroll through your warmup emails to emulate human-like reading
5. Open rate and reply rate targets: Choose the exact open rate, response rate and spam protection for your warmup emails

For bulk management across client domains, go to the Email Accounts dashboard, tick the box to select specific accounts or all accounts you want to edit, and in your top-right corner, click Bulk edit settings.

Watch How to Setup Your Cold Email System in 2024 for a complete 10-minute walkthrough of configuration including warmup setup.

Pricing for unlimited accounts

We built flat-fee pricing that eliminates the per-seat tax destroying agency margins. Our Growth package at $30 per month lets you warm unlimited mailboxes and send up to 5,000 emails monthly. Scale to Hypergrowth at $77.6 a month for 100,000 email capacity. For detailed plan comparisons, review the Email Outreach plans comparison.

Connect unlimited email addresses and automatically rotate sending across them. The more accounts you add, the more emails you can send. This flat-fee model eliminates the per-seat tax that destroys agency margins as you scale client workspaces.

"I find Instantly easy to set up with really nice UX, making the onboarding process smooth. The platform excels in scalability, allowing me to send a large volume of emails and manage workspaces effectively for sales and marketing." - Verified user review of Instantly

Ongoing maintenance after Day 30

Never stop warmup

You can never stop the email warmup process. Keep it running at all times to maintain superior engagement. Cold outreach engagement runs lower than regular email, so ongoing warmup ensures a healthy reply rate and keeps sender reputation up.

Many major mailbox providers have around a 30-day rolling reputation filter. This means that once warmup is completed, if there isn't any sending on that IP for 30 days, the IP address will cool down and the reputation will be reset.

Daily monitoring tasks (10-15 minutes)

Bounce rate check:

Check bounce rates daily in your dashboard. Maintain total bounce rate below 2%. Red flag threshold is >2% if you hit that level, pause campaigns immediately and investigate bouncing domains. A well-targeted outreach campaign should show 3-5% bounces or less after email verification.

Spam complaint monitoring:

Keep spam complaint rate under 0.1% to protect sender reputation. Red flag threshold is >0.1% if you exceed that, review content for spam triggers and audit your recipient list. Gmail's hard cutoff sits at 0.3% spam rate.

Blacklist status:

Use MXToolbox Blacklist Check daily with automated alerts. Any listing on major blacklists (Spamhaus, SURBL, URIBL) requires immediate investigation of root cause and submission of delisting requests.

Weekly maintenance tasks (30-45 minutes)

Trend analysis:

Compare current week vs. previous week for open rate trajectory, reply rate trends, bounce rate changes, and deliverability score trends. Document findings in a spreadsheet for monthly reviews and share with clients to demonstrate proactive reputation management.

ESP-specific performance:

Gmail leads with an 87.2% inbox placement rate, well above the global average of 83.1%, while Outlook trails at 75.6%. Segment campaign metrics by recipient ESP and if performance diverges significantly, review ESP-specific authentication requirements and adjust content for stricter filters.

Spam score spot-check:

Use Mail-Tester weekly to verify spam scores stay above 9/10. The spam test shows your spam score, where your email landed in 30+ different mailboxes, and provides recommendations to improve your score.

Monthly maintenance tasks (2-3 hours)

Authentication audit:

Run a full authentication audit monthly using MXToolbox. Verify SPF record validity and syntax, DKIM signature verification, DMARC policy enforcement, and MX record configuration. I recommend you monitor service provider announcements about infrastructure changes and update SPF records immediately when adding or removing email services.

Unengaged contact removal:

Remove unengaged contacts monthly to protect sender reputation. During your first 6 weeks, don't send to subscribers who haven't opened or clicked in 90 days. After that, identify contacts with no engagement in 30-60 days, segment into a re-engagement list, send 1-2 re-engagement campaigns, then remove still-unengaged contacts after 60-90 days total.

Content template rotation:

Avoid pattern recognition by spam filters through monthly template rotation, updated subject line formulas, varied call-to-action language, and testing new personalization variables.

For additional cold email best practices, review our Cold Email Strategy guide and explore our 600 templates for cold emails.

Common warmup mistakes that burn domains

Scaling volume too fast

Your email service provider monitors volume patterns closely. Sudden spikes from 10 emails Monday to 200 emails Tuesday trigger spam filters. ISPs classify that as unnatural behavior and penalize sender reputation immediately.

During the warmup phase, the more consistent you are with volume, frequency, complaint, and bounce levels, the faster you establish a positive sending reputation. If you send infrequently (anything less than weekly), it takes longer to build a positive sender reputation.

Mixing outreach before Day 14

During the initial warmup phase, try not to send outreach campaigns at all. If you decide otherwise, I recommend starting with a low volume and slowly ramping up each week. Introducing campaign emails too early risks burning a domain before you've established enough positive engagement history with ISPs.

Using purchased or unverified lists

Avoid buying email lists. They cause ISPs to flag your domain and block your IP. Only send emails to subscribers who signed up through your single or double opt-in process. People don't like receiving unrequested email, and unsolicited sends generate higher-than-average spam complaints and unopens, which quickly causes ISPs like Gmail to downgrade your reputation.

Bounce rates must be kept as low as possible and are easily managed by using an email verification tool. For agencies managing client lists of unknown quality, run full verification through services like ZeroBounce, NeverBounce, or Bouncer before loading contacts into campaigns.

Ignoring ESP-specific performance

Different email providers have different thresholds. If you notice poor performance with a specific provider, reduce volume to that provider while continuing to scale with others. The major mailbox provider entities don't share their algorithms with each other, so if a sender has an email audience list heavily weighted to one particular mailbox provider, they should create a specific warmup plan for that provider apart from the general warmup.

Inconsistent sending patterns

The most important component of your warmup period is to establish consistent email sending patterns. Email monitoring systems usually analyze the previous one to two weeks, and breaking your sending pattern damages reputation (though it doesn't fully reset it to zero).

For troubleshooting guidance when issues arise, review how fingerprinting affects deliverability and how to make sure emails get delivered in our Help Center.

ESP-specific warmup adjustments

Gmail-heavy audiences (>60% Gmail recipients)

Gmail remains the deliverability leader, boasting an 87.2% inbox placement rate. Gmail weighs domain reputation heavily and uses AI to analyze content patterns and user behavior, rewarding consistent positive engagement.

Recommended adjustments:

Extend warmup to 45 days vs. the standard 30-day timeline. Focus on warming up with your most engaged subscribers and avoid tipping reputation from good to bad by only adding older segments to engaged segments in chunks of 15 percent of existing volume. Slower progression of +5-10 emails every 3 days works better than daily increases for Gmail-heavy audiences.

Add sending domains to Google Postmaster Tools where important information is provided to build a good reputation. Target reply rates above 5% since Gmail rewards conversation threads, and prioritize personalization over promotional language.

Outlook-heavy audiences (>60% Outlook/Microsoft recipients)

Outlook trails at 75.6% inbox placement rate. Microsoft's filtering system focuses more on IP reputation and technical authentication than domain-based engagement history.

Recommended adjustments:

Standard 30-day timeline works well if all authentication is perfect. Maintain a steady sending volume during the entire warmup period at each ISP, with more predictable linear progression acceptable. Register with Microsoft SNDS for reputation monitoring and prioritize consistent daily volume over gradual ramps.

Conservative subject lines (avoid excessive punctuation, emojis), professional tone and formatting, and elimination of spam trigger words like "free," "urgent," and "limited time" perform better with Outlook's content filters.

Yahoo-heavy audiences (>60% Yahoo recipients)

Yahoo comes in close with an 86% inbox placement rate, showing a 6.96% improvement in Q2 2025 compared to Q1. Yahoo splits the difference between Gmail and Outlook, emphasizing domain reputation while responding well to proper authentication setup.

Recommended adjustments:

Accelerated 21-25 day warmup is possible if authentication is perfect. Yahoo's filtering is more forgiving of new senders with proper setup, so you can increase volume more aggressively after Day 10. Yahoo's filters are slightly more forgiving when authentication and unsubscribe mechanisms are properly configured.

Standard email marketing practices work well with Yahoo. SPF is sufficient for basic reputation, DMARC with p=none is acceptable long-term, and DKIM is recommended but not as critical as with Gmail or Outlook.

Mixed audience strategy

If no single ESP exceeds 60% of your audience, use the standard 30-day warmup timeline but design your strategy around the strictest ESP in your mix. Split up your warmup schedule so each ISP is receiving a comparable amount of mail each day to build reputation with all providers simultaneously.

Watch Instantly AI Full Tutorial for comprehensive platform guidance including ESP-specific campaign management.

Troubleshooting deliverability drops mid-campaign

When to reduce volume immediately

Watch for these red flags: bounce rates exceeding 3%, spam complaints above 0.3%, or inbox placement dropping below 70% for any major ESP. If you see any of these, decrease your volume by 25-30% immediately until metrics normalize.

Never increase your volume until you've looked at your messages' performance by receiver. If engagement and bounce rates seem normal, you're likely safe to increase the next day's volume. If metrics show problems, reduce immediately and investigate root cause before resuming ramps.

Diagnostic steps for sudden drops

When you see an unexplained deliverability drop, run these diagnostic tests immediately. Use Mail-Tester for spam score analysis, check blacklist status on Spamhaus, verify all DNS records through MXToolbox, and segment performance by ESP to identify whether issues affect all providers or just one. If email engagement is low, ISPs may reject your emails. The best counter is to check and clean your sending list before resuming.

Recovery protocols

Recovery takes time because sending reputation tracks on a rolling 30-day window. Plan for 4+ weeks to rebuild reputation. Every day you stay blocked costs you meetings and pipeline.

Recovery steps: Pause outreach campaigns immediately, continue warmup at reduced volume (50% of current), focus on most active subscribers (those who opened/clicked in past 30 days), retest every 3 days, and resume ramp only when metrics stabilize for 5 consecutive days.

If you need to reactivate warmup after it was disabled, follow our step-by-step guide to restore reputation safely.

Legal and compliance considerations

GDPR requirements for warmup emails

GDPR requires explicit consent (opt-in), transparency about data use, and allows individuals to access, correct, or delete their data. To stay compliant, obtain explicit consent before sending emails, provide clear options for recipients to access and delete their data, and communicate transparently about data usage.

The GDPR clarifies the terms of consent, requiring organizations to ask for an affirmative opt-in to send communications. Only if a marketing email does not present the option to unsubscribe, is sent to someone who never signed up for it, or does not advertise a service related to one the receiver uses is it violating the GDPR.

Your warmup pool participants are consenting users of warmup networks. Your "friends" are other users who enabled the warmup feature, so these exchanges don't require additional consent.

CAN-SPAM Act requirements

CAN-SPAM permits opt-out emails but mandates sender identification, clear subject lines, and a functional unsubscribe link. You must honor a recipient's opt-out request within 10 business days, and you can't charge a fee, require personally identifying information beyond an email address, or make the recipient take more than one step to unsubscribe.

Don't use false or misleading header information. Your "From," "To," "Reply-To," and routing information including the originating domain name and email address must be accurate and identify the person or business who initiated the message. Tell recipients where you're located by including your valid physical postal address in messages.

Outsourcing liability

You can't outsource legal responsibility for email compliance. Whether you handle email marketing in-house or hire an agency, you remain responsible for compliance with all email marketing laws. Both the company whose product is promoted and the company that sends the message may be held legally responsible.

Non-compliance leads to hefty fines, up to €20 million under GDPR or penalties of up to $43,792 per violation under CAN-SPAM.

For agencies, clear contracts defining compliance responsibilities, regular audits of list sources, and documentation of opt-in mechanisms protect both you and your clients from regulatory risk.

Ready to implement this plan

The 30-day warmup plan outlined above gives you a repeatable system to protect client domains, scale outreach safely, and maintain inbox placement above industry benchmarks. Outsourced teams face coordination friction managing multiple client infrastructures, but systematic warmup protocols and continuous monitoring eliminate the reputation variance that burns domains.

We centralize warmup for unlimited accounts, rotate inboxes automatically, emulate human reads, and run automated Inbox Placement tests so you keep emails in the primary inbox while protecting client domains. Start with our Growth plan at $37/month to warm unlimited mailboxes and send up to 5,000 emails monthly, or scale to Hypergrowth at $97/month for 100,000 email capacity.

Try Instantly free and use the slow ramp warmup plan detailed in this guide to launch your first client campaign with confidence. For more campaign strategies, watch 113 sales calls in 30 days with cold email showing real results from proper warmup execution.

FAQs

How long does it take to warm up a new domain for cold email?

Plan for 30 days minimum with no campaign emails during the first 14 days, gradually introducing campaigns at a 1:1 warmup-to-outreach ratio after Day 14 and reaching 30-40 daily warmup emails by Day 30 based on domain age.

Can I speed up warmup if I need to launch campaigns urgently?

Rushing warmup risks burning the domain permanently. Reputation rebuilds take 4+ weeks. Start campaigns on secondary domains that are already warmed if you need immediate capacity.

What bounce rate indicates I need to pause campaigns?

Pause immediately if bounce rate exceeds 3% in a single day or sustains above 2% for three consecutive days, then verify list quality and re-run email verification before resuming at reduced volume.

Do I need separate warmup for each client domain I manage?

Yes, each domain builds its own sender reputation independently, so every new client domain requires a full 30-day warmup cycle before launching production campaigns.

How often should I check deliverability metrics?

Daily dashboard checks take 10-15 minutes for bounce rates, spam complaints, and blacklist status. Weekly trend analysis requires 30-45 minutes. Monthly authentication audits and list hygiene need 2-3 hours.

Does Instantly's warmup work with Gmail, Outlook, and Yahoo equally?

We built our warmup pool with accounts across all major ESPs. Gmail leads with 87.2% placement while Outlook trails at 75.6%, so expect natural variance and adjust content or authentication for the strictest ESP in your audience.

What happens if I stop warmup after Day 30?

Many major mailbox providers have a 30-day rolling reputation filter, if there's no sending activity for 30 days, the IP address will cool down and reputation will reset, requiring you to restart warmup from Day 1.

Can I warm multiple domains simultaneously?

Yes, we include unlimited email account warmup on all plans. You can warm 3, 5, or 10+ client domains in parallel without additional per-account fees.

Key terms glossary

Inbox placement rate: The percentage of sent emails that land in the primary inbox folder rather than spam or promotions tabs.

Sender reputation: A score assigned by ISPs based on authentication setup, engagement history, bounce rates, spam complaints, and sending patterns over a rolling 30-day window that determines inbox placement.

Warmup pool: A network of consenting email accounts that exchange warmup emails to build positive engagement history. We provide a pool of 200,000+ addresses with a deliverability network of 4.2M+ accounts.

Bounce rate: The percentage of emails that fail delivery, with hard bounces (permanent failures like invalid addresses) and soft bounces (temporary issues). Maintain below 2% for healthy deliverability.

SPF (Sender Policy Framework): A DNS record that lists authorized mail servers for your domain. Must stay under 10 DNS lookups and include all legitimate sending sources to prevent authentication failures.

DKIM (DomainKeys Identified Mail): A cryptographic signature added to email headers that proves the message hasn't been altered in transit. Requires DNS TXT record with public key and must align with From domain.

DMARC (Domain-based Message Authentication): A policy that tells receiving servers what to do when SPF or DKIM authentication fails. Start with p=none for monitoring, move to p=quarantine or p=reject after establishing reputation.

Read emulation: A warmup feature that makes the system spend time scrolling through warmup emails to emulate human-like reading behavior, improving engagement signals sent to ISPs.