On 6/11/2020 11:16 AM, Mark Sapiro wrote:
On 6/11/20 8:23 AM, Brian Carpenter wrote:
The reason for the bounce will be contained in the outgoing SMTP logs.
This is true only if the message is rejected upon delivery from
Mailman's outgoing MTA. In some cases, the first hop MX will accept the
message, but a downstream MTA will reject it and return a DSN. In these
cases, you need to see the actual DSN, but I agree, the first place to
look is in the log of the outgoing MTA.
There's also "backscatter" where MDA/MUA (e.g. spam filter) will bounce
to the -- potentially spoofed -- From address.
Dima
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