Using port 587 with sendmail

I have been using sendmail to send out mails using internally available mail server. But currently port 25 is blocked for security reasons. I would like to know if there is a way to specify port number in the sendmail utility. I am trying to make use of the secure SMTP-MSA port 587 as an alternative assuming I could get that port opened up. I was not able to find anything in the man pages for sendmail. Is there any alternate utility that could do this?