[aklug] Re: Postconf review

  Yikes! I've forgotten more about programming than most people
  know, but I don't know s**t about email and it's relationship with
  dns and MX records.

  So : to quote Royce
> 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.
  I must ask the question - how do I reconcile MX records with my
  postfix config?

  Should I set
  myhostname = host266.hostmonster.com
  or not?
  thanks, Royce

* Royce Williams <royce@tycho.org> [150922 20:29]:
> 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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> >
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-- 
Tim 
http://www.akwebsoft.com, http://www.tj49.com
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