How do I change Dovecot virtual user passwords?

I used one web based control panel to create some virtual users for Dovecot. That control panel no longer works so I need to do this manually.

I need to reset the password for one (virtual) user which is listed in dovecot.passwd file. The file uses CRYPT schema. How do I reset that password?

So the question boils down to - what can use to convert plain text password to CRYPT encrypted format?

You can use the Apache utility htpasswd. It uses crypt() to encrypt passwords by default on Linux platforms. The following will prompt you for the new password for the user jscott and will update the file /etc/dovecot/dovecot.passwd.

htpasswd /etc/dovecot/dovecot.passwd jscott

You can use the doveadm utility that comes with Dovecot:

$ doveadm pw -s CRYPT
Enter new password: 
Retype new password: 
{CRYPT}1cElWVzS3.EVg

or to avoid the prompts do:

doveadm pw -s CRYPT -p yourpassword -u user