How to Set Up DMARC for Postmark

Publish a DMARC record to protect your domain when sending transactional email through Postmark.

Quick Answer — The Record You Need

Record Type

TXT

Host / Name

_dmarc

Value

v=DMARC1; p=none; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1

Postmark also offers a free DMARC monitoring tool at dmarc.postmarkapp.com.

Step-by-Step Setup

Ensure SPF and DKIM are configured

Verify both SPF (include:spf.mtasv.net) and DKIM are set up and passing for your Postmark domain.

Set up custom Return-Path (optional)

Configure a custom Return-Path (bounce) domain in Postmark for SPF alignment. This is optional but recommended.

Create the DMARC record

Add a TXT record at _dmarc.yourdomain.com.

v=DMARC1; p=none; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1

Use Postmark DMARC monitoring (optional)

Postmark offers a free DMARC monitoring tool at dmarc.postmarkapp.com. You can use their rua address for easy report analysis.

Enforce gradually

Move from p=none to p=quarantine to p=reject after confirming all senders pass.

Common Gotchas

Postmark has strong DKIM alignment by default. SPF alignment requires a custom Return-Path domain.
Postmark's free DMARC monitoring tool (dmarc.postmarkapp.com) is a great way to visualize reports without a paid DMARC service.
If Postmark is your only sender, DKIM alignment alone is sufficient for DMARC pass. You do not strictly need SPF alignment.

Verify Your Setup

After adding your DNS records, use our free DMARC checker to verify everything is configured correctly. DNS changes typically propagate within minutes, but can take up to 48 hours.

Frequently Asked Questions

Does Postmark offer DMARC monitoring?

Yes. Postmark provides a free DMARC monitoring tool at dmarc.postmarkapp.com that parses and visualizes your aggregate reports.

Does Postmark support DMARC alignment?

Yes. Postmark provides DKIM alignment automatically. For SPF alignment, configure a custom Return-Path (bounce) domain.

Can I use Postmark's rua address for DMARC reports?

Yes. Postmark's DMARC tool provides an rua address you can use. Add it alongside your own reporting address for visual report analysis.