Richard Clayton wrote:
>> If you do a reverse lookup and then check to see if the name resolves to >> the IP that you looked up you can tell it's fake. >> > > Yes, only the domain owner will be able to add particular IP addresses to > their records (if you assume DNS is secure, which could be unwise) > > BUT you'll get false positives as well because in the real world, things > are never always quite so tidy :( and forward and reverse don't always > match even when nothing specifically wicked is happening. > > ObExim: see "verify = reverse_host_lookup" for a way of testing for this > in an ACL -- so you can reject perfectly good email for purist reasons :) > > Remember - this is about determining who gets white listed, not rejected. If they have an innocent rdns error then they don't get while listed. -- ## List details at http://www.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://www.exim.org/eximwiki/
