[Mimedefang] OT: New Sendmail spam block
David F. Skoll
dfs at roaringpenguin.com
Thu Mar 24 13:39:26 EST 2005
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.
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