Well, I send mail to ietf-smtp(_at_)imc(_dot_)org to send to this list.
the domain is imc.org.
% dig +short MX imc.org
So, since there is an MX record, I know that I should send my e-mail to
mail.imc.org, which happens to have A and AAAA records.
Michael Storz wrote:
BTW, there is at least one email server without MX RR but AAAA RR we all
know. Just look into the header of this message. Do you see the
Return-Path? Yes? Well, you've found the host I mean.
There is no MX RR for mail.imc.org, but it has an A and an AAAA RR:
% dig +short mail.imc.org A
% dig +short mail.imc.org AAAA
Unfortunately, it does not have a corespondig/correct
% display_fwrev_mapping mail.imc.org
no: mail.imc.org -A-> 22.214.171.124 -PTR-> Balder-227.Proper.COM -A->
no: -AAAA-> 2001:470:1F04:392:0:0:0:2 -PTR->
properopus-pt.tunnel.tserv3.fmt2.ipv6.he.net -AAAA-> NXDOMAIN
Now, we can speculate
- Is the missing MX RR by intention?
- Is the administrator clueless?
- Is he lazy?
- Is it just a configuration error (mail.imc.org instead of imc.org)?
or we could just ask Paul Hoffman :-)