update/change "IMAP / POP3 / FTP login" for email user

I just updated the way the username is created for email/FTP but I already have 2 emails in use. The default user creation is user.domain - I have updated new users to be user.domain.ltd

How can I update the existing ones to the new pattern?


Unfortunately, there isn’t a way to change the username format for existing domains – changing that setting only changes new users.

The only way to update an existing user would be to delete and re-create the user account.


it’s a bit of a hack as it creates mail aliases but. . . just change all the defaults, then rename the domain and have it automatically update all users etc. you can enter the same domain name again.

In the end I just deleted the whole site (after making a backup copy of all data & emails) and re-created it. (then copied back the files and emails)