disallow some users to use webmail

[hkbyte]

Is there any plugins which can disallow some of the users/domains to login to roundcube even they have IMAP/POP login

[rosali]

No, nothing that I know.

But you could have a look into my DNSBL plugin (see links in signature) and modify it to block specific users.

[JohnDoh]

if you know the accounts which you want to allow login then you could log them in once and then set auto_create_user to false so no other accounts will be allowed. That depends if you know the ones you want to allow or only the ones you want to block.