Installation with nginx + dovecot cant login

[alexistkd]

Hi i have issues im new on this roundcube i have nginx, i configure roundcube then installed dovecot but for some reason i cant login with my root user/pass default of my unix machine. Theres some example dovecot configuration to enable so i can login with my root password? I have to copy/paste sql file? or i can install directly tru /installer path ? i tried both but no luck . Thanks.

here is errors:

Code Select Expand

Test SMTP config

Server: PHP mail()
Port: 25

Trying to send email...
SMTP send:  NOT OK(Mail delivery with mail() failed. Check your error logs for details)

its strange cause i have a vb forum and works the sendmail perfect.

and dovecot:

Code Select Expand

Connecting to localhost...
IMAP connect:  NOT OK(Login failed for root from 190.x.x.x.x. AUTHENTICATE PLAIN: Authentication failed.)