DMARC when using your domain name.

When using your own domain name, the DMARC setting can influence the look of your outgoing email.

In the explanations below, we will use these examples:

Your domain: or
Your Subscriber:     [email protected]

DMARC & the From: header

When your Subscriber's ISP has DMARC turned on.

DMARC forces Mailing Lists to alter the From: header.

When DMARC is on, the sending IP address must be a designated sender for the Subscriber's address.

If your Subscriber sends a message and their domain name has DMARC turned on, will alter the From: header.

Yahoo has DMARC turned on. This tells the world that any email from a Yahoo address must come from it's list of designated IP addresses.

Let's say your Subscriber "Suzi Q" has a Yahoo account and sends an email to the Mailing List.

Original From: header:
From: Suzi Q <[email protected]>

Since DMARC is turned on at Yahoo, makes this change:

Edited From: header:
From: Suzi Q (SuziQ at <[email protected]>
(NOTE: youremailgroup = the name of your Mailing List)

When your domain has DMARC turned on.

If DMARC is turned on for your base domain name (or lists domain) and the policy is set to Reject or Quarantine, then the From: header needs to be from and not your domain name. This is to ensure the sending IP address is a designated sender for the address in the From: header.

If DMARC is on for your domain (policy = Reject or Quarantine), then we make this change:

Edited From: header:
From: Suzi Q (SuziQ at <[email protected]>

How to keep your domain name in the From: header

Set your Mailing List's domain name DMARC policy to None.

From: header will look like this:
From: Suzi Q (SuziQ at <[email protected]>