[Mimedefang] Can MD/SA combo detect no reverse ip?

[Lucas Albers]

I have experienced the opposite of this, I do teh following checks in
sendmail:
dnl I can do a dns lookup on hte mailer, VALID mailers pass.
define(`_IP_LOOKUP_',1)dnl
dnl mailers that don't have a reverse lookup host-ip won't pass this.
define(`_DNSVALID_',1)dnl

I don't get any complaints from people about false positives because of this.
--Luke

> If a host has no reverse-DNS lookup, the the following condition holds:
>
> 	$RelayHostname eq "[$RelayAddr]"
>
> However, it's not a good idea to add 5 points for that condition,
> because in my experience, quite a bit of legitimate mail comes from
> servers without a reverse DNS entry.  I have a custom rule in my CanIt
> setup that adds 1.2 points in that case, and it seems to work fairly well.
>
> --
> David.