I have a dedicated box running Fedora Core 4/Plesk. I can receive emails just fine using the pop server: mail.domain.com (as directed by Plesk). However, when I try send mail using mail.domain.com (as directed by Plesk) I cannot connect to the server.
I submitted a trouble ticket to my dedicated provider but got a useless response, "You will need to configure your mail server software on your server."
Any ideas what I need to configure? There is no setting in the control panel to enable/disable SMTP. Could it be a DNS issue?