AOL has blacklisted me on one of their servers. I get this error.

Delay reason: SMTP error from remote mailer after end of data: host mailin-04.mx.aol.com [205.188.159.217]: 421-: (DYN:T1) http://postmaster.info.aol.com/errors/421dynt1.html 421 SERVICE NOT AVAILABLE

EXPLANATION:

The IP address you are sending from has been blocked due to AOL Member complaints and/or high volumes of e-mail.

Solution:

Call AOL POSTMASTER SUPPORT ! ( yes the boys that do the BLACKLISTING )

toll free               1-888-212-5537       

and ask them to remove your IP address from their black list.

or apply online to be added to their whitelist - http://postmaster.aol.com/