* 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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