This feature requires LISTSERV 16.5-2018a or later (build dates of 8 Dec 2018 or later).

Organizations which use DMARC "p=reject" or "p=quarantine" for their own domain, and where the outbound MTA used by LISTSERV (i.e., in its SMTP_FORWARD_n= settings) is authorized to send from the organization's domain, may use the new DMARC_NO_REWRITE configuration variable to prevent posters' addresses in their own domain from being rewritten.

Examples:

z/VM:

DMARC_NO_REWRITE = 'EXAMPLE.COM *.EXAMPLE.COM'

unix:

DMARC_NO_REWRITE="EXAMPLE.COM *.EXAMPLE.COM"

export DMARC_NO_REWRITE

Win:

DMARC_NO_REWRITE=EXAMPLE.COM *.EXAMPLE.COM

The default is the null string, that is, LISTSERV will perform a DMARC rewrite for any domain configured with "p=reject" or "p=quarantine" in its DMARC DNS record.