Vicki Brown:
> Can I insert a content filter before a relay via virtual_alias_maps
> or relay_recipient_maps?  Or are all relays done before any content
> filters could be run?
> Is there a clean way I can insert a content filter before the mail
> is relayed?

As documented, Postfix content filters run **before** Postfix
decides where to deliver mail.

http://www.postfix.org/CONTENT_INSPECTION_README.html
http://www.postfix.org/SMTPD_PROXY_README.html
http://www.postfix.org/FILTER_README.html
http://www.postfix.org/MILTER_README.html

> I'd prefer to have a good feeling for whether spam checking on
> there toaster will work before I start experimenting and possible
> break our incoming email.

To test a configuration before going live, use a test machine, or
configure a secondary Postfix instance if your Postfix distribution
has not broken http://www.postfix.org/MULTI_INSTANCE_README.html

        Wietse

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