Tried to send an email to my mother today. I have Mail.app configured to send mail out through exim running on my Debian box at home on my Comcast (formerly AT&T Broadband) cable modem. This is what I got back in return:
SMTP error from remote mailer after initial connection:
host mailin-02.mx.aol.com [22.214.171.124]: 550-The IP address you are using to connect to AOL is either open to
550-the free relaying of e-mail, is serving as an open proxy, or is a
550-dynamic (residential) IP address. AOL cannot accept further e-mail
550-transactions from your server until either your server is closed to
550-free relaying/proxy, or your ISP removes your IP address from their
550-list of dynamic IP addresses. For additional information,
550-please visit http://postmaster.info.aol.com.
I read about this the other day on /.. This is so stupid. My box is not an open relay and I have had the same IP address for over two years. Dumb.