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postfix: Prevent internel network traffic from using filter

I have these lines in my master.cf on postfix:

Code:

filter    unix  -      n      n      -      10      pipe

  flags=Rq user=filter argv=/usr/local/sbin/newfilter.pl ${sender} ${recipient}

smtp      inet  n      -      n      -      -      smtpd

        -o content_filter=filter:dummy

What this does is pass all the mail comming into the system througha custom filter I made.

This works great, no spam because of our filter. Problem is outgoing mail is also going through the filter. This is a problem because on some of our outgoign mail we get this error:
snippet from log:

Code:

Jun 26 17:34:08 gma-web postfix/smtp[14753]: 67AA838E: to=<luke@gabbartandwoods.com>, relay=mail-fwd.sbc-webhosting.com[161.58.18.5], delay=1, status=bounced (host mail-fwd.sbc-webhosting.com[161.58.18.5] said: 554 Validating Sender (in reply to RCPT TO command))

only a couple servers do this, but they always do it.

I disabled the filter and it no longer happened, however without the filter our incomming mail is also unfiltered.

So, how can I make the filter only work on mail not sent by one of the valid local e-mail addresses? FYI the people using this server connect using ms outlook over smtp and pop3, so outgoing mail is also sent using smtp from other systems.

You can probably use a variation of this:

Quote:

The above quote is from this page of the amavis documentation.