Net::SMTPUnknownError

Rails
1

when i’m trying to send mail i got this error

Net::SMTPUnknownError (relaylock: Unable to connect to Plesk Database:
Can’t connect to local MySQL server through socket
‘/var/lib/mysql/mysql.sock’ (2)
):

and it do not send the mail
any helps please

2

Oooh sorry i forgot to start mysqld deamon
/etc/init.d/mysqld start