Two dedicated email accounts with one network user account

This is indeed a bug that I have confirmed today with Apple Engineering, related to Kerberos Authentication. What we did as a work-around was to change the mail authentication method in Server to exclude Kerberos by using a Custom authentication method and selecting only the MD5 methods:

Each Open Directory user should then log off and then login to the server.

In each of the mail accounts in the Mail client, change the authentication methods to MD5 Challenge.

This finally allowed us to add multiple IMAP accounts to one mail client, without duplicating the mailboxes when a user is (bound and) logged into the server using Open Directory.

This has been filed as a bug by engineering and should be fixed in an upcoming release.

Peter

If as it sounds you are using Apple's built-in Mail server in Server.app then it normally uses the user accounts you create in Server.app to create matching email accounts and adding additional email addresses for an account in Server.app would result in aliases not separate email accounts - just like you describe.

One option would be to use a different mail server like Kerio Connect, then you can create multiple different email accounts which are not linked to the Open Directory users in Server.app. However another solution is to create an additional Open Directory account, you would then have two Open Directory accounts for this user.

They would only need to login to the computer using the first Open Directory account but you could then add the second email account as a second separate inbox using the second accounts login details.

• Create two separate Open Directory users, one called andreas the other called andreas.surname
• Have user login as user andreas
• Setup Mail with andreas account
• Add second email IMAP account as andreas.surname while still logged in as andreas
• You now have two separate IMAP accounts, and will see two inboxes in Mail