[Mimedefang] OT: New Sendmail spam block

[David F. Skoll]

Ben Kamen wrote:

> I've now run into 2 universities that are blocking email based on invalid
> hostnames at the HELO sequence.

I agree that this is wrong.

I do make use of HELO information in the following way:

1) I block anyone who HELOs as *.roaringpenguin.com if it's not one of
   my machines.

2) I block anyone who HELOs with a raw IP address like 1.2.3.4.  I do
   allow [1.2.3.4]

3) I block anyone who HELOs as [206.191.13.82], which is my server.

I've not yet had complaints about these blocks.

Regards,

David.