mail return

[apisit]

anyone know why my email return, sending by outlookexpress6 as the message below..
***********************************************
This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

xxx@xxxx.com
SMTP error from remote mailer after RCPT TO:<xxx@xxxx.com>:
host xxx@xxxx.com[00.00.00.00]: 550-(server.host.adress) [xxx.xxx.xxx.xxx] is currently not permitted to
550-relay through this server. Perhaps you have not logged into the pop/imap
550-server in the last 30 minutes or do not have SMTP Authentication turned on
550 in your email client.

cPanel.net Support Ticket Number:

[pagedeveloping]

Do you have authentication checked?

Inside your email properties under server make sure that you have My server requires authentication checked. It's on the bottom for Outgoing mail server.

cPanel.net Support Ticket Number: