[aklug] Re: Postconf review

I can't really speak to the Postfix config, but I can clarify the DNS
a bit more.

As Kevin noted, your current PTR record for 74.220.215.66 is
host266.hostmonster.com. If it's easy to change (or have Hostmonster
change) your PTR to be mail.tj49.com, that would work well.

But if your current PTR record can't be changed, you can change your
MX record instead, so that it points to host266.hostmonster.com
directly.

Both methods bring forward and reverse DNS into alignment. Ideally
(and even aesthetically :) ), having that hostname reflect the
expected mail flows' domain would be better -- but not strictly
required.

Royce

On Tue, Sep 22, 2015 at 6:48 PM, Tim Johnson <tim@akwebsoft.com> wrote:
> Hi Royce :
>
> To clarify your advice :
> ## The following would be acceptable as a remedy?
> myhostname = host266.hostmonster.com
>
> thanks
> -tim-
> * Royce Williams <royce@tycho.org> [150922 17:13]:
>> As long as both your MX records and your source of mail have forward
>> and reverse DNS that match, you should be fine. In other words, you
>> shouldn't have to change anything other than the minimum work to make
>> sure that stuff matches.
>>
>> Royce
>>
>> On Tue, Sep 22, 2015 at 4:53 PM, Tim Johnson <tim@akwebsoft.com> wrote:
>> > * Kevin Miller <atftb2@alaska.net> [150922 16:49]:
>> >> 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.
>> >>
>> > Thanks Kevin. I will probably have to have to change $myhostname
>> > since it is a shared server.
>> > cheers
>> > --
>> > Tim
>> > http://www.akwebsoft.com, http://www.tj49.com
>> > ---------
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>> >
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>
> --
> Tim
> http://www.akwebsoft.com, http://www.tj49.com
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Received on Tue Sep 22 20:17:55 2015