Email deliverability fixes
Every reason email lands in spam — and exactly how to fix it. Each guide is built from the same checks our scorer runs. When you're ready, test your email free and see which apply to you.
Why your emails go to spam — and how to prove it in 30 seconds
Emails landing in spam? It's rarely the words. Check SPF alignment, DKIM, DMARC, reverse DNS, TLS, BIMI and reputation first.
Fix SPF failures and alignment gaps
An SPF pass is not enough if it does not align with DMARC. Check your SPF record, lookup count, includes and Return-Path alignment.
Run a DKIM DNS audit
A DKIM DNS audit checks the selector, public key, key length, duplicate records and From-domain alignment behind a DKIM pass or fail.
Run a DMARC DNS audit
A DMARC DNS audit checks your _dmarc record, p= policy, rua reports, subdomain policy and SPF/DKIM alignment.
Fix SPF alignment
SPF alignment compares your Return-Path domain with your visible From domain. Learn why SPF can pass while DMARC still fails.
Check reverse DNS and HELO
Reverse DNS and HELO checks reveal whether your sending IP looks like stable mail infrastructure or disposable spam infrastructure.
Check MTA-STS and TLS-RPT readiness
MTA-STS and TLS-RPT help protect inbound mail with enforced TLS and reporting. Check DNS, HTTPS policy hosting and report routing.
Check BIMI readiness
BIMI readiness starts with enforced DMARC, then checks your BIMI DNS record, SVG logo, HTTPS hosting and certificate requirements.
Read your email authentication breakdown
A useful email authentication breakdown separates SPF DNS, SPF alignment, DKIM DNS, DMARC policy, reverse DNS, TLS and BIMI.
Add a one-click List-Unsubscribe header
Since 2024, bulk senders must include a one-click List-Unsubscribe header or get filtered. Here's the exact header to add.
Get your sending IP off a blocklist
Listed on Spamhaus or Barracuda? Here's how to confirm the listing, find the cause, and request removal the right way.
Spam trigger words — the honest version
Most 'spam word' lists are outdated myths. Here's what content signals modern filters actually weigh — and what to fix instead.
Cold email deliverability that survives 2026 filters
Cold outreach has the hardest deliverability profile in email. Here's the setup that keeps cold campaigns out of spam in 2026.
Email warmup, done right
A new sending domain with no reputation lands in spam. Email warmup builds that reputation gradually. Here's how warmup actually works — and its limits.
What a real email deliverability test measures
Most 'deliverability tests' only check headers. A real test measures inbox placement across Gmail, Outlook and Yahoo. Here's the difference that matters.
Set up DMARC from scratch
DMARC ties SPF and DKIM to your From domain and is required by Gmail & Yahoo. Here's how to publish a DMARC record and roll out enforcement safely.
What your email spam score actually means
A spam score estimates how likely your email is to be filtered. Here's what goes into one, what a good score looks like, and what to fix first.
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