Inbox Placement Tool: Reach the inbox with unlimited deliverability tests

Inbox placement is where a delivered email actually lands in the recipient's mailbox: the primary inbox, the promotions or social tab, or the spam folder. It goes a step beyond delivery, which only confirms the mailbox provider accepted the message. For cold email, landing in the primary inbox is what decides whether a prospect ever sees and replies to your outreach.

An inbox placement test sends test emails from your sending accounts to seed inboxes across providers, then reports which folder each one reaches: inbox, promotions, or spam. Instantly runs these tests inside the platform, syncing your connected accounts and campaigns, and notifies you if any sending account starts landing in spam. Tests are unlimited and automated, so you can check placement before and during a campaign.

Deliverability is whether the mailbox provider accepted your email at all, while inbox placement is where that accepted email lands: the primary inbox versus promotions or spam. A campaign can show a high delivery rate and still miss the inbox if messages are filtered to spam. Inbox placement is the more useful metric for cold email because it reflects whether prospects actually see your message.

Instantly tests inbox placement across Gmail, Outlook, Yahoo, and other leading mailbox providers. This lets you confirm your cold emails reach the primary inbox on each major platform your prospects use, rather than the promotions tab or spam folder. Testing across providers matters because inbox and spam filtering rules differ between Gmail, Outlook, and Yahoo.

Yes, you can start inbox placement testing for free with Instantly, which includes 25 free credits and requires no credit card. Paid plans then provide unlimited inbox placement tests and account setups under one subscription, so testing volume never holds your campaigns back.

A higher inbox placement rate is better, and email deliverability providers commonly cite around 90% or above as a strong result. The rate is the share of sent emails that reach the inbox rather than the spam or promotions folder. Running regular tests helps you catch a drop early, before poor placement quietly cuts your replies.

To improve inbox placement, fully authenticate your sending domains with SPF, DKIM, and DMARC, keep your accounts off blacklists, and remove content that trips spam filters. Instantly supports this by monitoring 400+ blacklists, detecting spam triggers with SpamAssassin, and checking SPF, DKIM, and DMARC in one place. Automated triggers flag deliverability issues before they reach your campaign results.

Test inbox placement regularly, ideally before launching a campaign and continuously while sending, since sender reputation and filtering rules change over time. Instantly makes this practical with unlimited, automated tests that run inside the platform and notify you the moment a sending account starts landing in spam, so you can act before placement problems spread across your accounts.