[vox-tech] some people can't send to list

[Wes Hardaker]

Bill Kendrick <nbs at sonic.net> writes:

> On Mon, Feb 23, 2015 at 11:24:10AM -0800, Rod Roark wrote:
>> On 02/23/2015 11:20 AM, Brian E. Lavender wrote:
>> > Hey, so word is that some can't send email to the lugod lists because the
>> > mailserver the MX record is a CNAME rather than an A record?
>> >
>> > brian
>>
>> Dunno who's administering the lugod.org domain, but whoever that is
>> should be able to fix it.
>
> That'd be me.  Thx for looking into it folks, I'll try to figure
> it out next time I'm on my home laptop (which has all the creds
> to get into things).

Hiya.  DNS geek here.  Things are still technically incorrect as
currently deployed.  You aren't supposed to have a name after a service
referral (in this case an MX) that is itself a CNAME referral.

This is fine:

  # dig lugod.org mx

  ;; ANSWER SECTION:
  lugod.org.              3600    IN      MX      10 www.lugod.org.

This is not:

  # dig www.lugod.org.

  ;; ANSWER SECTION:
  www.lugod.org.          3600    IN      CNAME   lugod.org.
  lugod.org.              3600    IN      A       173.13.165.50

*some* (most) DNS resolution software lets you get away with that, but
it's not legal according to the DNS RFCs and shouldn't be done.


The right thing to do would be to replace the MX record so it looked
like this:

  lugod.org.              3600    IN      MX      10 lugod.org.

Which would then work.  Though, the best thing to do is actually create
a new host record:

  lugod.org.              3600    IN      MX      10 mail.lugod.org.
  mail.lugod.org.         3600    IN      A       173.13.165.50

:-)
-- 
Wes Hardaker                                     
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