Am 21.11.25 um 09:57 schrieb Paul Smith via mailop:
Empty SMTP FROM doesn't mean it's a DSN. It means you don't want to
receive DSNs.
Autoresponses often don't want to receive DSNs, so a empty SMTP FROM
is appropriate
Autoresponses is one possibility, another one is spammers who use an
empty SMTP FROM because they (naturally) aren't interested in DSNs
either. One other option might be weirdly configured forwarders, I have
seen some examples of that.
Cheers,
Hans-Martin
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