I've been testing out the Newletter Manager on a site I'm working on but I can't get it to work properly. I assume it doesn't have to be setup anywhere (I can't see an option for any settings in admin), the main Email options section has the email type set to Sendmail (the sites is on a Linux server), I've also tried SMTP just to be safe and exactly the same problem.
This is the error I see when I send (obviously email address has my email in and server address has the full path on the server):
Warning: mail() [function.mail]: SMTP server response: 554 <email address here>: Recipient address rejected: Relay access denied in (server address here)adminincludesclassesemail.php on line 523
Anybody got any bright ideas?!