Well, I send mail to [email protected] to send to this list.  Therefore,
the domain is imc.org.

% dig +short MX imc.org
5 mail.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.

Willie

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
> 192.245.12.227
> % dig +short mail.imc.org AAAA
> 2001:470:1f04:392::2
> 
> Unfortunately, it does not have a corespondig/correct
> reverse-forward-mapping :-(
> 
> % display_fwrev_mapping mail.imc.org
> no: mail.imc.org -A->    192.245.12.227 -PTR-> Balder-227.Proper.COM -A-> 
> 192.245.12.227
> 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 :-)
> 
> Regards,
> Michael Storz
> 

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