I've created my mail domains and populated them all with mailboxes duplicating those on the old server. I did this through the ISPConfig panel. I've also copied the mail across using rsync, and have it neatly stored in the correct format and structure (confirmed by logging into one account which I reset the password for in the panel). I can quickly refresh the mailboxes at the time we go live to catch the recent changes. In past migrations, I managed to not reset the users passwords and I'm hoping to achieve the same this time. Original user hashes are stored in the postfix (database) mailbox (table) on the old server and the field in the database is in the format: or: On the new server, the passwords seem to be stored in the ispconfig (database) > mail_user (table) in the format: I'm looking for a way to replace the existing ISPConfig hashes with those of the old server, but is it able to check the user supplied passwords against PLAIN-MD5 and MD5-CRYPT hashes and if so, how should the prefix part be formatted? Thanks in advance.