Roundcube 1.4.3 Password Plugin Not working

[hrbappy]

Hello everyone. I have prepared a mail server recently. I installed postfix, dovecot & roundcube on ubuntu 20.04. I installed roundcube via apt-get install and it installed roundcube 1.4.3. In dovecote configuration (/etc/dovecot/conf.f/10-auth.conf) I have below configuration>>

disable_plaintext_auth = yes
auth_mechanisms = plain login !include
auth-passwdfile.conf.ext

In /etc/dovecot/conf.d/auth-passwdfile.conf.ext file I have below configuration:

passdb {
driver = passwd-file  args = scheme=PLAIN username_format=%u
/etc/dovecot/dovecot-users}

userdb {
driver = static  args = uid=vmail gid=vmail
home=/var/mail/vhosts/%d/%n }

And I have listed my virtual users at dovecot-users file in below format:

user@domain:password

virtual Users login/logout, sending/receiving mails are working fine through roundcube.

But I can not figure out which password driver to use and how. It will be appreciated if you look into my issue and help me.

Thanks in advance.

[alec]

There is no password plugin driver that supports this.

[hrbappy]

Hi Alec, Is there any way or what is your suggestion to fix my issue? I am kinda stuck with this.