[2001-12-08] Marc Haber wrote: (rejecting MAIL FROM:<>)
> People keep saying that this is a spam filtering measure. Clueless
> idiots, and I can't even block them :-(
There's a user submitted database of domains whose mailservers reject
DSNs at
http://www.rfc-ignorant.org/ so I imagine Exim4 will be able
to use domain-RBL to block them.
Currently I use the following (DSN blocking is a good spam metric):
if ("${lookup dnsdb {a=${sender_address_domain}.dsn.rfc-ignorant.org}{$value}}
is not "")
then
headers add "X-DNSBL-Warning: (dsn.rfc-ignorant.org) ${lookup dnsdb
{txt=${sender_address_domain}.dsn.rfc-ignorant.org}{$value}}"
endif
