[Mimedefang] greylisting does it still work?
Philip Prindeville
philipp_subx at redfish-solutions.com
Tue Apr 24 13:23:02 EDT 2007
ADNET Ghislain wrote:
> if greylisting use a policy based on a server able to resend email,
> could it be done in the helo phase as the source ip of the sending
> server should be enough to greylist it.
>
> Does going further using other data than that is usefull ? (perhaps to
> stop zombies behind a NAT router where a legitimate mail server runs ?
> ). Have you ever seen if moving the greylist to the hello phase change
> how filtering is efficient ?
>
>
Don't forget that some sites have an IP address with multiple
PTR records sometimes pointing at 2 dozen domain names
or more (shouldn't be allowed, but...).
So going by IP address instead of hostname is more reliable
in this case.
More information about the MIMEDefang
mailing list