MTAs, which operate on larger servers and which are also normally
online, can handle certificate revocation.
MTAs have no business making decisions on users' behalf.
It could be done at the message store, perhaps, but not in the MTA.
I second this. MTAs should stay out of it, leaving the
content alone, simply passing traffic. Message Store is an
implementation thing and could legitimately get involved.
Keith
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Rick Troth at La Casita, Houston, Texas, USA