A possible cause of not being able to send email through our servers is due to a system called SMTP AUTH. SMTP AUTH checks to see that you are authorized to send email before allowing you to relay messages through our mail server.
We use this system to prevent SPAM being sent through our mail servers, if the server did not check before allowing you to send email then anybody on the Internet could send email through the server.
You can enable "SMTP authentication" for your email accounts in your email client (Outlook).
NOTE: Some ISP's force you to use their SMTP servers to send mail by blocking your ability to make connections to external SMTP servers. Please check with your provider to see if they have this policy. If they do, you will need to use their SMTP servers to send email.
