Mailman 3 options and results:
DMARC mitigation action: Wrap the message in an outer message From: the list. DMARC Mitigate unconditionally: No DMARC rejection notice: DMARC wrapped message text: From: Michael Paoli via BALUG-test3 balug-test3@lists.balug.org Reply-To: Michael Paoli <[localpart](a)yahoo.com>
DMARC mitigation action: Reject the message DMARC Mitigate unconditionally: Yes DMARC rejection notice: Testing DMARC rejection DMARC wrapped message text: DMARC wrapped message text: headers may be munged (no munging when posted from @linuxmafia.com) posting from @yahoo.com bounces: Your message to the BALUG-test3 mailing-list was rejected for the following reasons: Testing DMARC rejection
DMARC mitigation action: Reject the message DMARC Mitigate unconditionally: No DMARC rejection notice: Testing DMARC rejection DMARC wrapped message text: DMARC wrapped message text: headers may be munged posting from @yahoo.com bounces: Your message to the BALUG-test3 mailing-list was rejected for the following reasons: Testing DMARC rejection
DMARC mitigation action: Wrap the message in an outer message From: the list. DMARC Mitigate unconditionally: No DMARC rejection notice: Rejected due to DMARC. DMARC wrapped message text: Because of DMARC, headers may be munged posting from @yahoo.com: adds a first MIME section that has: Because of DMARC, headers may be munged From: Michael Paoli via BALUG-test3 balug-test3@lists.balug.org Reply-To: Michael Paoli <[localpart]@yahoo.com>
DMARC mitigation action: Reject the message. DMARC Mitigate unconditionally: Yes DMARC rejection notice: DMARC wrapped message text: posting from @yahoo.com: our message to the BALUG-test3 mailing-list was rejected for the following reasons: You are not allowed to post to this mailing list From: a domain which publishes a DMARC policy of reject or quarantine, and your message has been automatically rejected. If you think that your messages are being rejected in error, contact the mailing list owner at balug-test3-owner@lists.balug.org.
Anyway, given the potentially non-ideal situation with DMARC, this seems best compromise: DMARC mitigation action: Wrap the message in an outer message From: the list. DMARC Mitigate unconditionally: No DMARC rejection notice: DMARC wrapped message text:
And hyperkitty has at least some display/munging issues: greater than symbol on at least end of email address shows as as apersand gt semicolon at symbol in at least email address show as (a)