I’m using postfix/dovecot with mysql backed accounts (compatible with postfixadmin) and I have a tiny bash script that:

* generates a random email

* asks for an optional description

* inserts new email to the database

* adds an entry to postgrey whitelist

* emails me the address and description (so I can search the email address later in my inbox if necessary)

Works a treat for me, but not something my family can use.