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David Woodhouse wrote:
[...] the single rule should be 'just don't generate bounce messages'.
You should never, during normal operation, accept a mail by SMTP unless
you're actually going to deliver it.
Do _all_ your checking, whether it includes SPF or not, before giving a
successful response to the end of the DATA. If you don't want the mail,
then just say so. Don't accept it and then find yourself stuck with the
task of bouncing it.
Very good advice indeed.
Actually even forwarders/relays should try to deliver a message to the
remote MTA in real time before accepting it themselves (sort of a
semi-proxy mode). Only if the remote MTA cannot be reached should the
message be accepted and stored for later delivery.
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