14.10.26   Al Iverson via mailop:

IMHO? Don't ever add a mailing list server's IP addresses (or SPF

Its correct, I wouldn't do it either.

A look at yesterday’s  (20.10.26) email log provides three examples:

<Envelope-from> | "From:Name_<From:addr>
<[email protected]> | "John_Wrangler"_<[email protected]>
<[email protected]> | Markus_Mordor_<[email protected]>
<[email protected]> | 
"Random_Randy,_Postmaster_via_mailop"_<[email protected]>

Adding the IP address of mailop.org to my SPF record makes no sense—neither for John Wrangler nor for Markus Mordor. The "mailop" mailing list does not use their respective domains in the "Envelope-from" field, which is precisely what SPF refers to. The situation is different with DMARC. The domains sample.com and sample.de either have no DMARC record, or their DMARC record is set to "p=none". It is a different story for "Random Randy": his domain has a DMARC record with "p=quarantine" or "p=reject". This is controlled by the mailing list software, provided that the corresponding option is enabled in the list's configuration. In Mailman and Sympa, this feature is available at the level of an individual list—not at the level of the entire mailing list server. Therefore, each list administrator must enable this option themselves. Not everyone is aware of this possibility—but the administrator of the "mailop" list certainly is.

Regards
Rainer Daeschler

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