nanog mailing list archives

Re: Mailserver requirements


From: Arnold Nipper <arnold () nipper de>
Date: Mon, 05 Apr 2004 23:53:15 +0200


On 05.04.2004 23:42 Daniel Roesen wrote:

On Mon, Apr 05, 2004 at 11:32:08PM +0200, Arnold Nipper wrote:

    I am surprised you don't have problems sending to AOL as well.
They don't accept email from servers that do not have reverse addresses.
I don't accept email from severs without reverse addressing.         

of course this server does have a reverse mapping. But this reverse
mapped doamin does not have an MX record.


Does it have an A RR?


It also does have an A RR. And the forward mapping does also match the
IP address.

Anyway... it's a heuristic which definately does give false positives.
The only requirement is that IF a domain/host accepts mail there MUST be
a postmaster@ address.


In this case the host *sends* mail ...



Arnold


Current thread: