I have added 2 new users to our SBS2003 Std server. All users email on behalf of our company mail account. email@example.com.
The problem is the 2 new users are coming back with the following error.
firstname.lastname@example.org on 27/06/2006 8:24 AM
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<mail.company.com.au #5.5.0 smtp;553 company.local does not exist>
I have compared the new account to old accounts and can not see any difference. All users have send on behalf of permissions for the email@example.com account.
They also have full access rights to the firstname.lastname@example.org user account to check incoming emails, contacts, etc.
The user accounts have their reply email addresses as email@example.com (have deleted their firstname.lastname@example.org) so they do not have an external mail address.
They can send on behalf of the email@example.com account to an internal email address with no issues and from their own account to internal email addresses.