Dear All,
I got the solution. Actually,I forgot to modify main.db.php file,which is having main entries of MYSQL.
2nd thing, to enter into Roundcube webmail,you must have valid user name & password.In my case,I am using Sendmail as an MTA. So,i have created a normal user in Linux & by using the same user,i can able to login.
Thanks,
Nishith.
:cool: