Problem: Users of POP3 mail clients are unable to send mail through the Internet Agent.
Possible Cause: Allow Message Relaying has been turned off.
Action: Make sure Allow Message Relaying is turned on. In ConsoleOne, browse to and select the Domain object where the Internet Agent is installed. Right-click the Internet Agent object, then click Properties.Click Access Control > SMTP Relay, select Allow Message Relaying, then click OK.
Exit, then restart the Internet Agent.