[Cialug] MTA HELO

[Paul Gray]

On 01/12/2014 08:47 AM, Kevin Smith wrote:
> I'm I wrong? Postfix configured to reject connections from mail serves
> whose HELO is not a FQDN. It doesn't try and resolve it. Stops a ton of
> Spammers at the front door. This has not been an issue for 15 years.
> Recently our payroll guys upgraded and now their mail server doesn't return
> a FQDN. So, mail is rejected. I said set a FQDN even if it's made up. They
> want me to Whitelist them; I'm pretty sure at this level Whitelisting isn't
> an option. I'm not sure their system administrator knows what I'm talking
> about.

This behavior is part of the requirement for the HELO found in the RFCs.
I think this topic has come up on the list before, so it's not too
uncommon to find it causing problems.

In fact, if you look in the archives for where my foot is in my mouth
having claimed that there wasn't such a requirement in the RFC, that's
where you'll find the particular citations.

My suggestion is to urge them to fix their side, because, well, that's
where the problem is.

-- 
Paul Gray                                         -o)
314 East Gym, Dept. of Computer Science           /\\
University of Northern Iowa                      _\_V
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