From: Victor Duchovni (Victor.Duchovnimorganstanley.com)
Date: Tue Dec 02 2008 - 12:27:20 CST

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On Tue, Dec 02, 2008 at 10:02:37AM -0800, David Jonas wrote:

> > What version of Postfix are you using?
>
> 2.3.8 and 2.4.6-- yea, we're a little behind. Perhaps I'll bring us up
> to 2.5 today.

I am not aware of any "transparency" issues in either of those releases.
You don't need to upgrade. There was once an undesirable interaction
between "transparency" and 8-bit to 7-bit conversion, but that was
in Postfix 2.0 snapshot (at the time called 1.1.N-YYYYMMDD) releases.
This was fixed before 2.0.0.

> >> -92,6 +83,7
> >> -=20
> >> +.=20
> >
> > Most likely Ebay sending software fails to implement RFC 821/2821/5281
> > correctly:
> >
> > http://tools.ietf.org/html/rfc5321#section-4.5.2
> >
> > not much you can do about that. Postfix can't possibly know all
> > the places in which the Ebay software screwed up.
> >
> > The RFC is quite clear, leading "." characters in SMTP are stripped
> > regardless of the following character. Some MTAs only trim "." when
> > the next character is also a ".", but this violates the RFC.
>
> I will attempt to file a bug with eBay/PayPal. Thanks. I'm going to try
> to set up a clean environment (no processing at all) to make sure this
> is definitely real and not just a side effect. Nothing touches the body
> right now, but the message does get juggled a bit before being sent out
> again.

A tcpdump capturing the SMTP traffic from EBAY should show the lack
of propper "dot-stuffing" in their sending engine.

If they do it correctly, perhaps you have content filters or down-stream
SMTP senders that are broken. What software other than Postfix do
the messages traverse before forwarding?

--
        Viktor.

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