Ian P. Christian wrote on 2009-07-18: > I urge you, and everyone else running an MX to just outright reject > mail from hosts without rDNS - there's no excuse for mail server > admins not to do this, and people not being strict means spammers can > get away with more on botnets. > > The stricter we all are, the better.
A quote from fresh message to the Russian-language exim-users list http://exim.org.ua/pipermail/exim-users/2009-July/007287.html : | у многих маленьких компаний с которыми мы | работаем - нет PTR-записей для IP-адресов почтовых серверов. I translate: | Many small companies we work with haven's PTR records for | IP-addresses of mail servers. Then the poster asked how to whitelist. In my experience, I was given a shell account for setting up a mail autoresponder (for requesting parts of a mailing list archive) on a machine with static IP-address without PTR record, the small company which owned the machine hadn't control over PTR records, the (large) ISP couldn't care less. I greylist mail from hosts without rDNS. I also deny all mail from China and Korea. The set of these two measures is quite effective. -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
