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Re: MTA

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On Mon, 5 Jul 2021 09:35:22 -0400
Greg Wooledge <greg@wooledge.org> wrote:

> On Mon, Jul 05, 2021 at 09:23:03AM -0400, Polyna-Maude
> Racicot-Summerside wrote:
> > Reporting-MTA: dns; premium58.web-hosting.com
> > 
> > Action: failed
> > Final-Recipient: rfc822;bjoern.ricks@greenbone.net
> > Status: 5.0.0
> > Remote-MTA: dns; mail.greenbone.net
> > Diagnostic-Code: smtp; 550 X-Host-Lookup-Failed: Reverse DNS lookup
> > failed for 162.213.253.79 (failed)  
> 
> unicorn:~$ host 162.213.253.79
> 79.253.213.162.in-addr.arpa domain name pointer cyrania.com.
> unicorn:~$ host cyrania.com.
> cyrania.com has address 172.67.185.109
> cyrania.com has address 104.21.59.235
> cyrania.com has IPv6 address 2606:4700:3031::6815:3beb
> cyrania.com has IPv6 address 2606:4700:3031::ac43:b96d
> cyrania.com mail is handled by 0 _dc-mx.f1202d9a4fb3.cyrania.com.
> 
> Your "reverse" (PTR record for 162.213.253.79) doesn't match.  Which
> is to say, none of the "A" results from cyrania.com. match the
> original IP address of 162.213.253.79.
> 
> Some SMTP receivers may care about that.  Apparently the receiver for
> greenbone.net (whose name is mail.greenbone.net) is one of them.
> 

It's a pretty common requirement, as at one time it was the second best
spam defence (after accepting mail only for named users). Not so good
now that many ISPs are providing some kind of PTR record. But I haven't
deleted the check from my mail server...

-- 
Joe

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Thread

MTA Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-05 15:30 +0200
  Re: MTA Greg Wooledge <greg@wooledge.org> - 2021-07-05 15:40 +0200
    Re: MTA Vincent Lefevre <vincent@vinc17.net> - 2021-07-05 16:00 +0200
      Re: MTA Greg Wooledge <greg@wooledge.org> - 2021-07-05 16:10 +0200
        Re: MTA Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-05 16:30 +0200
          Re: MTA Vincent Lefevre <vincent@vinc17.net> - 2021-07-05 17:10 +0200
          Re: MTA John Hasler <john@sugarbit.com> - 2021-07-05 17:20 +0200
        Re: MTA Vincent Lefevre <vincent@vinc17.net> - 2021-07-05 16:50 +0200
          Re: MTA Joe <joe@jretrading.com> - 2021-07-05 22:40 +0200
    Re: MTA Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-05 16:00 +0200
      Re: MTA Vincent Lefevre <vincent@vinc17.net> - 2021-07-05 16:00 +0200
        Re: MTA (corrected) Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-05 16:40 +0200
          Re: MTA (corrected) Vincent Lefevre <vincent@vinc17.net> - 2021-07-05 17:10 +0200
            Re: MTA (corrected) Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-05 17:50 +0200
            Re: MTA (corrected) Joe <joe@jretrading.com> - 2021-07-05 22:20 +0200
              Re: MTA (corrected) Vincent Lefevre <vincent@vinc17.net> - 2021-07-06 12:00 +0200
          Re: MTA (corrected) Greg Wooledge <greg@wooledge.org> - 2021-07-05 18:50 +0200
            Re: MTA (corrected) Greg Wooledge <greg@wooledge.org> - 2021-07-05 19:10 +0200
              Re: MTA (corrected) Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-05 19:20 +0200
                Re: MTA (corrected) Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-09 22:20 +0200
            Re: MTA (corrected) Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-05 19:10 +0200
    Re: MTA Joe <joe@jretrading.com> - 2021-07-05 22:10 +0200
  Re: MTA Joe <joe@jretrading.com> - 2021-07-05 22:30 +0200

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