External email users cannot use IMAPS/SMTPS

We have an email server running but since Mountain Lion (ML) server we do not have the webmail for external users and they are now forced to use email clients on PCs etc., which would be acceptable, if it worked.
This has created a weird problem... they cannot read and send email anymore.
Our server is using SSL and our preferred settings are:
IMAP
Port 993
Authentication: CRAM-MD5
SMTP
Port 587
Authentication: CRAM-MD5
The mail server is set to use automatic authentification (which I do not like because of the clear text option)
All this worked honkey-dorey before on Lion Server, but not now on a fresh installation of OS X ML Server. Only when using an iPhone or and iPad (3G mobile/cell connections) or being on our LAN can people read and send mail. We have users externally in Belgium, Denmark, Serbia, Turkey and Spain, and none of these users can now access their email. All the external users no matter if they use MAC/WINDOWS/LINUX clients have the same problems.
Looking the log at the same time when the users attempt to log in to check email just verify that the server is rejecting their connection in spite of them using correct credentials. The users get messages ranging from incorrect username or password to incorrect password but I can login into their accounts locally or from the LAN.
Could this problem be related to the usertype Local or Local Network User?
Any ideas or help is greately appreciated?
Peter
(Now, if anyone from Apple should happen to read this then note that it would be greatly appreciated if Apple could mature and stabilize so these severe changes to vital services could be avoided. If you support webmail (good or bad) in one release then continue to do so and if you have an advanced interface to the server functionallity like in Snow Leopard, please let us, the users, be able to keep using those tools rather than using the current 'Nintendo' interface.)

Hi Peter
Because this is working internally, it should be easy enough to solve.
First thing, most likely obvious, you do have port 993 open to your server?
Second, please post logs. Since we are dealing only with imap, just the imap (mailaccess) log will do.
Third, webmail functionality can be restored. Roundcube or Squirrelmail can be installed on your ML server. Roundcube takes a number of steps, but has a great/fast interface, its waht 10.7 used. Earlier versions of server used SQuirrelmail.
If you are under heavy pressure to get this up now and don't want to wait for forum responses, you can find contact info in my profile.
Jeff

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