On Thu, Mar 24, 2011 at 11:54:03AM +0200, Tom Kinghorn wrote:
> We have a number of clients who have misconfigured applications
> on their network, which is sending anything from warning to info
> messages to the developer.
>
> Our servers are used as an outbound relay (smarthost) for our
> clients.
>
> Is there a way to filter messages before they are sent out
> _
> example:_
>
> If the mail comes from u...@domain.tld & the recipient is
> anotheru...@anotherdomain.tld & the Subject is <whatever>,
> then Discard / Reject the message
Headers are only available in the message body (DATA portion of
SMTP's dialogue), so you would need a content filter or milter to
filter as you have described.
http://www.postfix.org/FILTER_README.html
http://www.postfix.org/MILTER_README.html
If you can figure out how to do this without relying on content,
other options are available, including restriction classes and
policy servers:
http://www.postfix.org/RESTRICTION_CLASS_README.html
http://www.postfix.org/SMTPD_POLICY_README.html
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