So here’s the hack that everyone has been doing:
Place this in your hosts file. It forces pop.earthlink.net to point to mx1.earthlink.net (as of 7/6/04 that is).
### Hack to get earthlink mail to not eat sh!t
207.217.125.16 pop.earthlink.net
The problem:
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.