Phaser 6180MFP-D SMTP error 016-503

I am trying to set up a Phaser 6180MFP-D to send scans by email. I have confirmed the following;

1. I can print to the printer.

2. The TCP/IP configuration is correct.

3. The SMTP server name smtp login credentials are correct. I can yse those credentials and send from my computer which is on the same net at the printer.

I keep getting error 016-503. Please help.

Joe Klovance