why I'm gettin previous mails even after db is replaced with new db in roundcube

[kishore]

Hi

I have installed and configured roundcube webmail server on centos 7 machine, its working fine. I can able to send and receive mails through browser.
If I create a user in server with useradd commandline is that user will be created in DB? If I send a mail through browser is that content of mails are stored under DB?
In roundcube configuration file if i replace db with new db, whether i can view the content of previous mails of existing users.

[SKaero]

Emails are stored by the mail server not Roundcube, therefore changing the Roundcube database would have no effect on the emails. A user record is only created in the Roundcube database when the user first log into Roundcube.