Some Internet Service Providers do not allow you to use external SMTP E-mail servers to send outbound mail. In order to send outbound SMTP E-mail, you will need to configure your E-mail client to use your ISP's SMTP server and not mail.atlantisnet.com.
Below are some common SMTP servers used by major ISPs:
SBC Yahoo (details):
Bell South (details):
* These servers require authenticated SMTP using the user name and password assigned to you by your ISP.
Notice: We have recently implemented a workaround for the sending of E-mail through our servers using ISPs that block TCP port 25. You can attempt this workaround by following the instructions here.