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David Woodhouse wrote:
For mail destined to domains for which we're backup MX (relay_domains),
or to the virtual domains (which are mostly forwarded elsewhere), this
does an SMTP callout to verify the recipient.
Note that this is not exactly what I meant. Proxying the MAIL FROM and
RCPT TO commands is a first step, but really the DATA command should be
proxied, too, in order to cover any content checks that the receiver
system might perform. Only if the receiver system accepts the DATA
command and the message data with a 2xx status code, should the
forwarding/relaying/proxying system "accept" the message vis-a-vis the
calling system. (Or of course if the receiver system isn't reachable.)
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