Why Is My Email Going to Spam?
The real reasons legitimate email lands in spam — mostly authentication — and a practical checklist to fix deliverability and reach the inbox.
By the ToolsHub team · Updated May 1, 2026
When legitimate email lands in spam, the cause is almost always authentication, not the words in your message. If receivers can't verify the mail is really from you, they treat it with suspicion. Run our Email Deliverability Check first — it usually points straight at the problem.
The most common causes
- Missing or broken SPF, DKIM or DMARC — the number-one reason. All three should exist and pass.
- Your sending IP is blacklisted — check it against spam databases with our IP Blacklist Check.
- No reverse DNS (PTR) on your mail server's IP.
- Poor sender reputation — from past complaints, spam-trap hits, or sudden volume spikes.
- Spammy content — misleading subject lines, all-image emails, or link shorteners.
A practical fix-it checklist
Publish a valid SPF record, enable DKIM signing, and add DMARC. Warm up new sending domains gradually rather than blasting thousands of messages on day one. Keep your lists clean and make unsubscribing easy. And since Google and Yahoo now require authentication from bulk senders, treat SPF, DKIM and DMARC as mandatory, not optional.