Article:
  Defending Your Site Against Spam, Part 2
Subject:   RBLs should not be taken too seriously
Date:   2003-08-11 22:57:16
From:   drunelson
Response to: RBLs should not be taken too seriously

Yes, but most large ISP's make their customers
relay their mail through their own servers
and not to sites on the internet. Earthlink,
for example, will not let you connect to port
25 on any host on the internet. I think this
belief that any host will send mail on the internet will go away as ISP's are forced to control their spam problem.