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On 01/09/02 at 15:48, andrew wrote:
Re: mailserver A''s/CNAME''s
From: Global Homes Webmaster
Date: Wednesday, January 9, 2002
Time: 1:01:40 pm
> Now, I tell all my clients to use "pop.xyz.com" for POP, and
> "mail.xyz.com" for SMTP...I don't have a good reason for this, except
> that it seems other people do this and who knows, maybe I'll split it
> between two servers in the future.
Giving yourself the option of splitting POP and SMTP off onto separate
machines is a valid reason for doing that. As long as their on the same box,
though, POP clients can use either name.
> The real question is, to avoid reverse lookup problems with AOL, should
> "pop.xyz.com" be an A record pointing to the IP address of the server, or a
> CNAME record pointing to "mail.xyz.com"
>
> I assume that it's a bad idea to have 2 A records and 2 PTR records both
> pointing at the same IP.
It's not a bad idea to have two (or more) A records pointing the same IP
address. In fact, it's quite common. It _is_ a bad idea to have two PTR's for
the same IP address. AFAIK, it's legal according to the RFCs, but it can lead
to problems and is definitely not recommended (kind of like chaining CNAMEs).
In your case, the PTR for your mail server should point to the name that's
used for it in MX records (i.e., mail.xyz.com.).
Christopher Bort | cbort@globalhomes.com
Webmaster, Global Homes | webmaster@globalhomes.com
<http://www.globalhomes.com/> | PGP public key available on request
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