Jesse Stroik wrote: > Matt wrote: > > > > Everyone should block/defer ALL email with no reverse DNS. Then > > maybe those email admins would get a clue. > > No, they shouldn't. > > There are plenty of places still using mail gateways where the mail > server used for sending is still on an internal network, for a variety > of legitimate reasons, and those mail servers may resolve to a private > address. If you discard all mail with no appropriate reverse DNS, > you'll be discarding a lot of legitimate mail too from a lot of > legitimate mail configurations.
What does having the mail gateway on an internal network have to do with anything? If it is going to send mail to the Internet, then it must have a public IP address in order to do so. This address may be local to the machine or it may be translated by a router or firewall, but either way there must be a public IP address used by the mailserver. All the rDNS test cares about is that this public IP address resolve back to a name...ANY name. This should not be a problem for any mail gateway installation. -- Bowie
