Using Agaric's MySQL-based Postfix e-mail configuration
These are the instructions sent to Dan Melançon for Mountaineer Grading.
In PHPMyAdmin on the live server:
Go to the emailserver database
Browse or go to the virtual_users table.
Check the number of entries in the table. So long as we don't delete any, the next record you create should use this number plus one as its ID. Specifically, you need to make your new record have an ID of one more than the last inserted ID (note that only 30 entries are shown on a page by default).