> If the filter is after the
> server providing the form page and the SUBMIT button, yes, the
> server received the message. IETF can have a log file before the
> filter (SOP), allowing review of what is filtered.

Substantially similar capabilities are present in all of the SMTP
MTA's I'm familiar with.  If a message delivery attempt is rejected
early, only envelope information is logged, but if the message was
rejected in error, that's generally sufficient to identify what needs
to be whitelisted.

                                                - Bill

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