[aklug] Re: Postconf review

On 09/22/2015 03:46 PM, Tim Johnson wrote:
> mail.tj49.com and mail.akwebsoft.com are (I hope that I'm using
> the right word) aliases for host266.hostmonster.com
>
> What would you do to correct this?
> Should I set $myhostname as host266.hostmonster.com ?
>
> thanks for the reply
> -tim-

I would contact hostmonster and ask them to set the reverse record to
point to mail.tj49.com.

If they don't want to do that, then setting $myhostname is probably your
best bet. If they will change it, you need to pick which hostname you
want to use.

This is important mostly when you send mail. If you send to one of the
email servers I run at work for instance, it will look at the hostname
your server posts, and do a DNS lookup on it. It will then take the IP
address that is returned and do a lookup on that. If they don't match,
you get rejected. Not all email admins are as pigheaded as me, but it's
a pretty common way to run a server.

So long story short, you need to decide what name you want your email
server to use when it's serving up mail, and make sure that the pointer
record (reverse record, i.e. IP address) points to the cname you want to
use.

Note that the "From" and "Reply to" domains don't have to match the
domain of the mail server. My work email is sent as domain juneau.org.
  The mx host has a domain name of ci.juneau.ak.us however. So you can
send as tim@akwebsoft.com or tim@tj49.com. The critical part is that
the forward and reverse records match.

HTH....

...Kevin

-- 
Kevin Miller
Juneau, Alaska
http://www.alaska.net/~atftb
"In the history of the world, no one has ever washed a rented car."
   - Lawrence Summers
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