maillist mx discard policy

Jeff Laine wtf.jlaine at
Thu Aug 19 06:54:56 UTC 2010

Hello list,

My question is regarding official maillist smtp servers. I'm trying to 
subscribe on "security-notifications", but (for some reasons) our 
outgoing MX has no PTR record and rejects my message:

 >Reporting-MTA: dns; xxx
 >Arrival-Date: Mon, 16 Aug 2010 17:18:39 +0400 (MSD)
 >Final-Recipient: RFC822; 
freebsd-security-notifications->request at
 >Action: delayed
 >Status: 4.7.1
 >Remote-MTA: DNS;
 >Diagnostic-Code: SMTP; 450 4.7.1 Client host rejected: cannot find 
your hostname, [x.x.x.x]
 >Last-Attempt-Date: Mon, 16 Aug 2010 21:24:36 +0400 (MSD)

I have the SPF record set up for our domain which designates our 
external IP as a valid sender address for the domain, but I still get 

So, the question is: do the maillist servers follow SPF 
records or PTR record is mandatory?


Best regards,

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