When someone receives an error message like this:

Content-type: text/html
Software error:
SMTP RCPT command failed: Please check your SMTP mail server name. This server seems to exist but does not seem to allow us to relay mail. There may also be a problem with one of the email addresses you are trying to mail to. at d:/80sxchange.com/ubbcgi/ubb_lib_mail.cgi line 39
For help, please send mail to this site's webmaster, giving this error message and the time and date of the error.

This means that the person the system is trying to email has a bad email address. Either it has changed, become inactive (like the 80sxchange.com email addresses), or is giving back some kind of error.

When AmyLivin changed her email address (got rid of the 80sxchange.com one) I stopped getting the error message when sending her a Private Message.

If anyone happens to see this error, please take down the username of the person it's happening to so I can try and contact this person to get a new email address for the system. I believe Roemello and Shakey are two people who's seen this so far...

Thanks!

I got the message from 'MeltWithMe' using the 'e-mail original poster' option of the move topic thing.