From: Scott Kitterman (postfixkitterman.com)
Date: Wed Jan 18 2006 - 08:03:20 CST

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On 01/18/2006 08:56, Jussi Silvennoinen wrote:
> > > > Jan 18 13:15:43 web postfix/qmgr[26578]: 004CF51DC2:
> > > > from=<SRS0=PVEe=3O=k.st=jasonvor3%TEXT1%srs.kundenserver.de>,
> > > > size=2968, nrcpt=1 (queue active)
> > >
> > > Admittedly, the address LOOKS odd.
> >
> > However odd it may look, it is fully RFC compliant. In fact
> > user%hostdomain, is legacy Sendmail source route syntax, and is even
> > supported by Postfix. This interpretation of the local-part is a local
> > matter, neither sanctioned, nor endorsed by the RFC.
> >
> > This said, addresses of the form '%foodomain' or 'foo%domain' are
> > not recommended, because Sendmail compatible systems may experience
> > indigestion. They are never the less quite legal.
> >
> > > > If they are correct how can Postfix (Version 2.2.8) be configured to
> > > > reject and if not where do i find the reference in the RFC.
> > >
> > > Use a regexp/pcre check_sender_access map:
> > >
> > > /%/ 554 Huh? Percent?
> >
> > No. This is way too strict, and *will* block legitimate email.
>
> Usually very small quantities of it. However, if you talk a lot to
> Lotus Notes systems, don't use that. I'm averaging about 150 messages
> (0,0075%) a day to a similar rule. Most of it is pure junk.
>
> Funny that I see the same (almost) envelope-sender here.

I believe that this is the source of that construct:

http://www.openspf.org/srspng.html

Scott Kitterman

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