Thanks for your suggestion.
I understand that is required to use encrypted passwords. But that is exactly what I did do, at the same time as changing the database table to make the passwords encrypted.
The result was that connection attempts were refused, with the mail log showing an error message quoting the plain text password submitted through the mail client, and showing the encrypted password from the database, along with text telling me that they did not match.
So what I'm trying to find out is whether Courier is expecting the same encryption as used by ViMbAdmin (i.e. MD5) or whether there is a need to specify the encryption used to Courier, or what.
Last edited by counterpoint; 1st August 2011 at 18:57.