Re: [exim] Unrouteable mail domain

On Mar 3, 2007, at 1:32 PM, W B Hacker wrote:

>
>
> All well and good, but neither:
>
> 'zestsystems.com' (resolved to IP 203.122.59.27)
>
> nor 'mail.zestsystems.com' (resolved to 203.122.59.43, their
> published MX)
>
> ...respond from either Hong Kong or Zurich.


They respond from amsterdam, though:

marco@websrv02:~$ telnet mail.zestsystems.com 25
Trying 203.122.59.43...
Connected to fox.spectranet.com.
Escape character is '^]'.
220-fox.spectranet.com ESMTP Exim 4.52 #1 Sat, 03 Mar 2007 19:40:03
+0530
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.

Bad routing or maybe it was down temporarily? Either way an
unresponsive host should not cause an 'unroutable address' error but
should cause an e-mail to get stuck on the queue for a bit.

This, however, is the problem:

marco@websrv02:~$ host -t MX zestsystems.com
zestsystems.com mail is handled by 10 203.122.59.43.

That MX record containts an IP address, where it should contain a
hostname. This /is/ causing exim to not be able to route the domain.