sending mail from Mailer plugin is slow in development syst

Hi everyone,

Here i am facing a problem with mailer in my development system which doesn't have smtp in that . Its taking too much time to send mail, it is taking 2 or 3 min to send 5 mail continuously . Anybody plz tell me why its taking that much time . Is it bcz their is no SMTP installed so when i send mail the mailer will wait for a period of time to get response from SMTP.