Why Are My Emails Going to Spam? 9 Reasons and How to Fix Each

Few things are more frustrating than sending an important email and finding out it landed in the recipient's spam folder — or never arrived at all. The good news: deliverability problems are rarely random. They almost always trace back to a short list of fixable causes, and most have nothing to do with what you actually wrote.

Here are the nine most common reasons your emails go to spam, and how to fix each one.

1. Your domain has no SPF, DKIM, or DMARC

This is the big one. SPF, DKIM, and DMARC are DNS records that prove your email is really from you. As of 2024, Gmail and Yahoo require bulk senders to have them — and even for low-volume senders, missing records are one of the fastest ways to get filtered.

Fix: publish all three. SPF lists who's allowed to send for your domain, DKIM cryptographically signs your mail, and DMARC tells receivers what to do with anything that fails. If you're not sure what you have, a scan of your domain will show exactly which are missing.

2. Your SPF record is broken or too broad

SPF fails silently in two common ways: it has more than the allowed 10 DNS lookups (very easy to hit if you use several email services), or it ends in ~all (softfail) or +all (allow everything) instead of -all. Both weaken the signal that keeps you out of spam.

Fix: consolidate your include: statements to stay under 10 lookups, and end the record with -all once you're confident every legitimate sender is listed.

3. You're not signing with DKIM

Without DKIM, receivers have no cryptographic proof your message wasn't forged or altered in transit — and forwarded mail in particular tends to fail. Unsigned mail from a domain that could sign looks suspicious.

Fix: enable DKIM in your email provider (Google Workspace, Microsoft 365, and every reputable service give you a record to publish) and confirm it's actually signing outbound mail.

4. Your DMARC policy is missing or set to p=none forever

A DMARC record at p=none collects reports but doesn't protect your domain — spoofed mail still gets delivered. Leaving it there permanently means anyone can send email as you, which drags down your domain's reputation.

Fix: start at p=none to see who's sending as you, then tighten to p=quarantine and eventually p=reject once your legitimate senders all pass.

5. Your sending domain or IP has a bad reputation

Mailbox providers score every sender. A new domain with no history, or one that's sent spammy mail (or been spoofed), starts with low trust. Buying a list or blasting cold email from your main domain can tank your reputation fast.

Fix: warm up new domains gradually, keep volume steady, and never send cold outreach from the domain you rely on for real mail.

6. Too many recipients mark you as spam

Providers watch how people react to your mail. If recipients delete without opening, or hit "report spam," your future mail gets filtered more aggressively — sometimes for everyone on that provider.

Fix: only email people who expect to hear from you, make unsubscribing easy, and remove anyone who hasn't engaged in a long time.

7. Your content trips spam filters

Content matters less than authentication, but it still matters. ALL-CAPS subject lines, "FREE!!!" and money words, a single giant image with almost no text, and shady link shorteners all raise your spam score.

Fix: write like a human, balance text and images, and link to real, reputable domains.

8. Broken or mismatched links and "from" addresses

If your visible "From" address doesn't align with the domain that actually passed authentication — or your links point somewhere different from where they claim — filters treat it as a spoofing signal. This is exactly what DMARC alignment checks for.

Fix: send from a real address on your authenticated domain, and make sure your links match your brand's domain.

9. Missing reverse DNS (PTR) or an unencrypted connection

Mail servers check whether your sending IP has a valid reverse DNS (PTR) record and whether you support TLS encryption. Missing either makes you look like a misconfigured or throwaway sender.

Fix: if you run your own mail server, set a PTR record and enable TLS. If you use a provider, they typically handle this — but it's worth confirming.

Start by finding out what's actually wrong

Most of these problems are invisible until you check — and guessing wastes time. Before you change anything, find out exactly which records you're missing or misconfiguring.

That's what this tool does: enter your domain and get an instant A–F grade on your SPF, DKIM, DMARC, and MX records, with a plain-language fix for anything that's failing. It's free, runs in seconds, and there's nothing to install — the checks happen right in your browser.