On 26 Jul 2015, at 20:12, Viktor Dukhovni <postfix-us...@dukhovni.org> wrote:
> On Sun, Jul 26, 2015 at 07:59:48PM +0200, DTNX Postmaster wrote: > >> Make everything 'zed.grinta.net', forward and reverse, including your >> MX record, and create CNAME records for your convenience, such as mail >> client configuration. If you need an A apex record, just create that >> separately, don't use it for sending mail. > > Read that carefully, the hostname in the MX record SHOULD NOT be > a CNAME: > > Good: > > example.com IN MX foo.example.com. > foo.example.com. IN A 192.0.2.1 > > Not good: > > example.com IN MX foo.example.com. > foo.example.com. IN CNAME bar.example.com. > bar.example.com. IN A 192.0.2.1 > > The second form is tolerated by most MTAs, but violates RFC > reqirements to avoid CNAMEs on the right hand side of MX records. Yes, that's why I am saying 'forward and reverse' before MX :-) As in, specific to the original poster's configuration, the DNS lookup results should look like this; == $ host zed.grinta.net zed.grinta.net has address 109.74.203.128 == $ host 109.74.203.128 128.203.74.109.in-addr.arpa domain name pointer zed.grinta.net. == $ host grinta.net grinta.net has address 109.74.203.128 grinta.net mail is handled by 10 zed.grinta.net. == $ host smtp.grinta.net smtp.grinta.net is an alias for zed.grinta.net. zed.grinta.net has address 109.74.203.128 == Mvg, Joni
