Guides · updated 2026-09-06

Why Are My Emails Going to Spam?

When mail lands in spam, or bounces outright, the cause is almost always one of a handful of things. Work down this list in order. Every item is something you can check today, without waiting on anyone.

1. You are on a blacklist (DNSBL/RBL)

One listing on a major blocklist like Spamhaus can sink your delivery in an afternoon. Run your sending IP and domain through the free checker. Listed? Here is how to get delisted.

2. SPF, DKIM, or DMARC is missing or weak

Since 2024, Google, Yahoo, and Microsoft expect authenticated mail from bulk senders. No valid SPF, no DKIM, no DMARC policy — and your mail gets throttled or dropped in the spam folder. The SPF/DKIM/DMARC setup guide covers all three.

3. No reverse DNS (rDNS/PTR)

Your sending IP needs a PTR record that resolves back to the same IP — full-circle rDNS. Plenty of mail servers flat-out reject IPs where the rDNS is missing or does not match. This one is on your host: ask them to set the PTR for your sending IP.

4. Poor sending reputation

• A sudden volume spike reads as spam. Warm new IPs up gradually.
• High bounce rates cost you. Scrub invalid addresses, and never touch a purchased list.
• Complaints add up fast. Make unsubscribing one click, and only mail people who opted in.

5. Content and infrastructure signals

• Broken or expired TLS on your mail or web host chips away at trust.
• Link shorteners and spammy phrasing push up your spam score.
• A From domain that does not match the Return-Path breaks alignment.

Fix it once, then keep it fixed

Deliverability is never done — reputation shifts day to day. Deliveradar watches your blacklist status, SSL, domain, and SPF/DKIM/DMARC around the clock and tells you the moment one of them breaks. Start monitoring free.