Request reverse dns mapping advice

John Levine johnl at iecc.com
Mon Sep 5 16:46:01 UTC 2016


>1.  pick a primary domain from the list of virtual hosts (example2.com)
>2.  use the "real" host name of the server (juvat.example1.com)
>3.  the mail server name (mail.example1.com)
>4.  the dns server name (ns2.example1.com)
>5.  another domain from the virtual hosts list (example 3.com)

Publish a PTR with the mail server name, forget about the rest of
them.  

On today's Internet, you want your mail server to EHLO with a name
that has matching forward and reverse DNS with the server's IP.  If
you don't, you look unnecessarily like a spambot.

Everyone knows that web servers and DNS servers have multiple names,
and neither should be sending unsolicited traffic, so matching rDNS
doesn't matter.

Opinions vary on how well it works to return multiple PTRs.  My
advice is don't borrow trouble you don't need.

R's,
John



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