View source for Indirect mail flows and DMARC

DMARC is an anti-phishing technology. It has recently been repurposed by large mail providers for public webmail domains.

DMARC ''alignment'' requires that the From: line address in a mail message match either a DKIM signature d= domain, or an SPF-validated bounce address domain. Depending on a domain's published policy, unaligned mail may be quarantined, i.e., relegated to the spam folder, or rejected with a 5xx SMTP code by recipient systems. A variety of long standing mail practices often create unaligned mail.

== Forwarding ==

* discussion mailing lists
* annotating forwarders
* annotating anti-virus

== Third party origination ==

* Newspaper mail-an-article
* Small clients at ESPs
* Notifications from devices