How to Check If Your Emails Are Going to Spam

You cannot improve what you do not measure. Here is how to check whether your cold emails are actually reaching the inbox or quietly dying in the spam folder. Method 1: Seed account testing The most reliable method is to send test emails to seed accounts you control across Gmail, Outlook, and Yahoo. Create free email accounts on each provider and include them in a small test batch. Check each inbox to see where your email landed — primary inbox, promotions, or spam. This is manual but gives you direct visibility. For an automated version, use the free deliverability checker at Warm Inboxes, which runs this test across multiple providers and reports results instantly. Method 2: Monitor open rates as a proxy If your open rates suddenly drop from 55% to 20%, you almost certainly have a deliverability problem. While open rates are not a perfect metric (privacy features can inflate them), a dramatic decline is a reliable signal that your emails are being filtered. Method 3: Google Postmaster Tools If you are sending to Gmail recipients (which make up a large percentage of B2B contacts), Google Postmaster Tools shows you your domain's reputation, spam rate, authentication success rate, and delivery errors. Set this up on every domain you send from. Method 4: Check blacklists If your domain or IP has been blacklisted, your emails are likely going to spam. Run your domain through the blacklist checker to check against all major blacklists simultaneously. Method 5: Ask your recipients If you get a reply from a cold email prospect, ask them: "By the way, did this email land in your primary inbox or somewhere else?" This gives you real-world data from actual recipients. Method 6: Check your authentication Authentication failures cause spam placement. Verify your SPF, DKIM, and DMARC records using the free tools at Warm Inboxes: SPF Checker, DMARC Checker, DNS Checker.

How often to check

Run deliverability tests before every new campaign launch. During active campaigns, test weekly. If you notice any drop in performance metrics, test immediately. Catching problems early prevents long-term damage to your sender reputation.

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