Jon LaBadie via Postfix-users:
>
> I've been getting a lot of spam with Date: headers
> containing future dates, typically 1 year.
>
> I don't find any header checks that would look for
> this type of message. Have I over looked it?
>
> In the meantime I've implemented a script and procmail
> rule to examine my messages. But that is post-delivery
> and per-user.
Postfix built-ins typically block mail based on a single indicator
(a well-known signature). A sledgehammer approach.
Dates and other indicators are typically handled by a scoring system
such as as SpamAssassin and the like. They plug into Postfix via
the (before queue) Milter protocol.
Wietse
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