Our mail servers are configured securely. This means that you cannot simply reference "mail.yourdomain.com" as an outgoing mail server unless you successfully log in via one of your pop accounts at "mail.yourdomain.com' before you try to send. This is called "check before send", a setting to prevent spammers from using our mail servers as havens for unsolicited eMail. If you are getting a "relaying prohibited" or "disconnected by administrator" error, it means that you haven't logged into the pop3 server at your domain before you tried to send through the SMTP server at your domain. To log in, you need to check for mail first.
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