503 This mail server requires authentication when attempting to send to a non-local e-mail address

[psx]

Hi

I'm testing MailEnable.

When I try to send emails (from gmail) to an account I have created at my mailenable server - I get this error:

The error that the other server returned was:
503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.

I have checked that in SMTP Properties - advanced SMTP tab - it is set to "Do not require authentification" for delivery to local addresses

Aby idea what might be wrong?

[MailEnable-Ian]

Hi,

Does a valid domain exist under the postoffice where the user resides? Does the mailbox have a valid mapped email address?