[Cialug] Hostname issue

[Jonathan A. Kollasch]

On Tue, Nov 25, 2014 at 09:38:09AM -0600, L. V. Lammert wrote:
> Trying to assist a friend in fixing an issue with their email system, ..
> they appears to be using a Barracuda appliance (per hostname), yet it
> appears to not be sending a valid hostname:
> 
> ================
> 
> Nov 23 03:38:37 mx2 postfix/smtpd[5951]: NOQUEUE: reject: RCPT from
> unknown[66.186.99.236]: 450 Client host rejected: cannot find your
> hostname, [66.186.99.236]; from=<rhayden at gilstermarylee.com>
> to=<lvl at omnitec.net> proto=ESMTP helo=<barracuda.gilstermarylee.com>
> 
> ================
> 
> I do know they are switching providers, but I do not think that would
> affect the issue. Any suggestion on how to troubleshoot this problem?

This sounds like 66.186.99.236 doesn't have reverse DNS records.

	Jonathan Kollasch