I have installed Roundcube v0.8.4 on my VPS server. I have used PostfixAdmin to create mailboxes and aliases, etc. Now I'd like to activate the password plugin in Roundcube so that users can change their passwords within Roundcube interface. My PostfixAdmin's encrypt method is set to 'md5crypt' which is its own internal crypt method. I've tried changing this to 'mysql_encrypt' but when I change the password of some account, I cannot log in anymore. So I've switched back to 'md5crypt'. But now, I don't know what the UPDATE query in the password plugin should look like. Is there a way to set this up correctly?