How Mail-List.com handles DMARC Reject settings
Mail-List.com will automatically compensate for any domains that have set up DMARC policies of Reject or Quarantine
DMARC and Mailing Lists do not play well together
Traditionally, mailing lists keep the Author's email address in the From header of messages sent to the subscribers of the mailing list.
The server sending the message to the subscriber belongs to the mailing list service, not the Author of the message.
From: John Doe <email@example.com>
SPF defines where emails should originate
SPF records in DNS list the valid IP addresses that email should come from.
DMARC define whether emails should be rejected
DMARC records in DNS can ask other ISP's to reject email not from those designated IP Addresses in SPF.
DMARC policy of Reject or Quarantine
Tells other ISP to Reject or put in the spam folder any emails that arrive from IP addresses other than those specified in the SPF record for that domain
Therefore, messages from your subscribers to mailing lists will never reach the other people on the mailing list
Mail-List.com will automatically adjust the From: header
For any Author's email that has DMARC policy of Reject or Quarantine
From: john at doe.com <firstname.lastname@example.org>
The address in the angle brackets is considered the email address, while the rest of the words are just a comment or Friendly name
Each time an email message is sent to the mailing list, Mail-List.com will check for DMARC settings in DNS
If DNS says p=reject or p=quarantine
Then mail-list.com will alter the From: header, so that it does not come from the Author's domain name
Therefore, domains with subscribers on Mail-List.com mailing lists do not have to take any action
When the DMARC policy is changed, we will notice automatically and take appropriate action.