* Forwarded (from: personal) by mark lewis using timEd/2 1.10.y2k+.
* Originally from waldo kitty (1:3634/1000) to mark lewis (1:3634/12).
* Original dated: Tue Mar 17, 13:24

-------- Forwarded Message --------
Subject: Re: [Weasel] 450 Errors In Weasel Pro
Date: Sun, 15 Mar 2015 22:46:42 -0700
From: Steven Levine 
Reply-To: weasel-list@os2voice.org
To: weasel-list@os2voice.org

In <550664ED.9020001@pmoylan.org>, on 03/16/15
    at 04:06 PM, Peter Moylan  said:

Hi Peter,

>The "return path not verifiable" usually means that the receiving server
>is trying to check that the claimed sender's address is a genuine mail
>account. Typically it does this by starting a "send mail" transaction to
>the address named in the MAIL FROM command, but aborting it before
>actually sending anything. If this attempt fails, it concludes that the
>send in the MAIL FROM command is a fake.

Is this still true for a significant number of today's MTAs?  I was under
the impression that these days most use SPF or one of its successors.

>In this case, though, it appears to be checking the _recipient's_
>address (robert.wolfe@winserver.us), and discovering that winserver.us
>will not accept mail for robert.wolfe.

I don't read it this way.  As I read the logs, it is the comcast
mailserver that is rejecting the MAIL FROM with a 450.

Reading between the lines, the MAIL FROM is foo@os2bbs.org and the RCPT TO
is robert.wolfe@winserver.us.

>Maybe we need to see a longer section of the log to work this out.

We also need to know what the senders MX record looks like.  If we assume
that mail.os2bbs.org is the mx then the reject make sense if the comcast
mail server does SPF validation.

Steven

-- 
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"Steven Levine"   Warp/DIY/eComStation etc.
www.scoug.com
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 * Origin:  (1:3634/12)