Skip to content


valid reverse DNS now required to mail an AOL user

Given that something like 8.13% of of the hosts that have sent non-spam mail to me do not have reverse DNS information recorded, the fact that AOL have just switched this on as a requirement will be interesting:

: jm ftp 1019...; dig mx                3559    IN      MX      15   92      IN      A
: jm ftp 1020...; telnet 25
Connected to
Escape character is '^]'. ESMTP mail_relay_in-za1.6; Thu, 22 May 2003
15:09:54 -0400
220-America Online (AOL) and its affiliated companies do not
220-     authorize the use of its proprietary computers and computer
220-     networks to accept, transmit, or distribute unsolicited bulk
220-     e-mail sent from the internet.  Effective immediately:  AOL 
220-     may no longer accept connections from IP addresses which 
220      have no reverse-DNS (PTR record) assigned.
telnet> q
Connection closed.

1 Comment