Robert Chalmers:
> Q1.
> 
> Already in my master.cf I have
> 
> smtp      inet  ...
> #smtp      inet  ...
> smtp      unix  ...
> 
> However, the set up for spamassassin requires another smtp line.
> 
> smtp      inet  ...
> So are they mutually exclusive ? or can I use it without breaking postfix 
> already.

There can be only one "smtp inet" line in master.cf. Typically you
would specify a unique IP address and port to receive mail from a
content filter, as described in http://www.postfix.org/FILTER_README.html
Look for something like:

    127.0.0.1:10025 inet ... (see "man 5 master" for syntax)

The 127.0.0.1 makes the service inaccessible from other systems
(or at last, harder to access).

> Q2
> Is it possible to implement spfpolicy, and greypolicy and if so how?

Yes.

> I have tired - but mail then fails.

Insufficient data to determine what mistake you made.

        Wietse

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