Patchkit

Setup guide

Postmark: SPF, DKIM and DMARC

Postmark needs a DKIM TXT record with a date-based selector and a Return-Path CNAME. No change to your root SPF record is needed.

DNS records to add

TXTHost<date>pm._domainkey
<DKIM value from Postmark → Sender Signatures → DNS Settings>Get this value from your provider's dashboard.

DKIM signing key

CNAMEHostpm-bounces
pm.mtasv.net

Custom Return-Path so SPF aligns

Steps

  1. In Postmark open Sender Signatures → your domain → DNS Settings.
  2. Publish the DKIM TXT record exactly as shown; the selector contains a timestamp.
  3. Publish the pm-bounces CNAME and click Verify for both records.

Good to know

  • Our DKIM check can't guess Postmark's selector. Enter it (for example 20240212123456pm) to check the key.

Adding records at your DNS host

Cloudflare · Namecheap · GoDaddy · Amazon Route 53

Check your setup

After publishing, run the domain health check. DNS changes usually appear within minutes, but can take up to a few hours. Official reference: Postmark documentation.