[MM3-users] Re: Sending to mangled 'From' addresses.

On 2024-06-01 09:49:54 -0700 (-0700), Mark Sapiro wrote: [...]

If this is the result of a reply and not reply-all the client is not behaving reasonably. [...]

I haven't seen it with replies, but rather mail clients recording every address they see into their address book, and then when the user of such a client wants to send new mail to someone they start typing that person's name and their mail client happily auto-completes it with the mailing list's address instead of the intended personal address.

This is one of the reasons we don't use DMARC mitigations for most of our lists, and instead we just try to make Mailman avoid altering anything in the message headers or body that might invalidate DKIM signatures (so no changing From or Reply-To, no adding list-specific subject prefixes, no appending list unsubscribe info to the end of messages...). It's an unfortunate trade-off, but some of our users do tend to get confused by address book pollution.

Jeremy Stanley