send mail without sendmail daemon?

[Song Jianping]

Hello,

Today i find i can send mail to others without running
sendmail as daemon. It seems sendmail daemon is only in
charge of receiving mail from other machines.

I am wonderring whether i can send thousands of mails by repeatly
calling sendmail directly. Will sendmail return on successfully
inserting the mail into mail queue or on delivering the mail to
remote host?

Best regards,
 Song                          mailto:[EMAIL PROTECTED]