From: Anthony Howe
Date: 2004-10-18 11:58:06 -0400
Subject: Re: How Can I get around this?
More information..: http://www.milter.info/#Support
Upwood, Jim wrote:
> This Mainframe is sending e-mail with the from as this:
OK. I've found the syntax in the RFC 2821 grammar:
Looking at `Path' and `A-d-l', it does appear valid and that I've
overlook it (believing it to be obsecure rare cases). Its actually a
form of routed address syntax. Looking at the Bat Book:
Would imply send mail to A, then A will relay to B, B to C, and C
handles final hop to D. This is similar to:
Both are forms of relaying syntax, similar to the old bang-paths. I can
certainly parse it, BUT for certain milters like milter-sender, it might
be impossible to perform a call-back directly to VMMAIL@LBDC.STATE.NY.US
as it might be "guarded" by LBDRSCS.LBDCVM.STATE.NY.US.
The question I have to deal with is for milter-sender is: Do I try and
call-back on the ultimate destination, knowing it will fail and fallback
on grey listing, or do I connect to LBDRSCS.LBDCVM.STATE.NY.US and test
if VMMAIL@LBDC.STATE.NY.US is accepted? Imagine a spammer that says:
Instead of doing the MX lookup on `bogus.com', I'm suppose to do it on
`spam.biz'. Essentially you are being directed to call-back to a machine
probably setup to say "yes" to all queries.
Anthony C Howe +33 6 11 89 73 78
7116561 AIM: Sir Wumpus
"Once...we were here." - Last of The Mohicans
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