MailerSend Retires DKIM TXT Records on 1 February 2027: Move to the New CNAME Records

Short answer: MailerSend fully retires DKIM TXT records on 1 February 2027. If your domain still uses the old TXT key, add the two new CNAME records from your MailerSend dashboard now so your mail keeps passing DKIM. The new keys are 2048-bit and MailerSend rotates them without DNS changes.

WhoMailerSend
Statusconfirmed
Dates
  • 2027-02-01: MailerSend stops supporting DKIM TXT records (announced 8 Sep 2026)

Who is affected

MailerSend customers whose sending domain was set up with the older DKIM TXT record. Domains already on the two CNAME records need no change.

What you will see

Check your setup today

  1. In MailerSend, go to Email → Domains and click Manage next to your domain. See whether it asks for one DKIM TXT record (old) or two CNAME records (new).
  2. Look up the DKIM name shown there, for example nslookup -type=TXT name._domainkey.yourdomain.com. A TXT answer with a key and no CNAME means you still have to migrate.
  3. Run our checker to confirm SPF and DMARC. DKIM selector names differ per account, so take the name from the MailerSend screen.

How to fix it

  1. In MailerSend, go to Email → Domains and click Manage next to the domain.
  2. At your DNS host, create the two new CNAME records exactly as MailerSend shows them.
  3. Back in MailerSend, tick I have added DNS records and click Re-check now.
  4. Send a test to a Gmail address and open Show original: DKIM should say PASS for your domain.
  5. That's it: MailerSend rotates the 2048-bit keys itself from then on.

Check your domain now

After the fix, send a test email to see SPF, DKIM and DMARC pass on a real message, then keep an eye on it: free DMARC monitoring shows every service that sends mail as your domain and which ones fail, in plain English.

Rather not touch DNS? I set up SPF, DKIM and DMARC without breaking your other senders, with a before/after report.

Get it fixed on Fiverr

Prefer to do it yourself? Get the step-by-step Fix Kit ($15) – 28-page guide, checklist, 20+ providers.

Related pages

Sources

Other upcoming changes