Fix guide

How to Fix DMARC Alignment for Postmark

Postmark DMARC alignment requires adding a custom Return-Path CNAME and DKIM record to your DNS. Postmark is one of the easiest providers to configure for full alignment.

Why alignment fails

Without sender signature DNS, Postmark cannot align DKIM and SPF with your From: domain.

Exact DNS records

pm-bounces.yourdomain.com → CNAME → (target from Postmark) DKIM TXT at host shown in Postmark (e.g. pm._domainkey or similar)

Step-by-step fix

Step 1 Postmark → Sender Signatures → your domain

Step 2 Copy the DKIM TXT record Postmark provides

Step 3 Add Return-Path CNAME (e.g. pm-bounces) for bounce domain

Step 4 Add records at your DNS provider

Step 5 Wait for green verification in Postmark

Step 6 Confirm DKIM and SPF alignment with DNS Preflight

Verify alignment and DNS in your browser

Open DNS Preflight →

Related glossary: DMARC · DMARC alignment · DKIM · SPF record

FAQ

What are the Postmark DMARC alignment steps?

Add DKIM TXT and Return-Path CNAME from Postmark's Sender Signatures, verify in Postmark, then confirm with DNS Preflight.

Why is Postmark easier than other ESPs for alignment?

Postmark uses a small, clear set of DNS records and strong documentation — typically DKIM TXT plus one bounce CNAME.

How do I verify Postmark DNS?

Postmark dashboard shows verification status. DNS Preflight can confirm public DKIM and SPF records.

Can I get both SPF and DKIM alignment with Postmark?

Yes — the Return-Path CNAME enables SPF alignment; DKIM TXT enables DKIM alignment.

Does Postmark support DMARC p=reject?

Yes when alignment passes — monitor reports when tightening policy.

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