Local SMTP Server

I am trying to write a legitimate application for work but need to test it out.
The IT dept is crap at getting back at me so I gave it a go myself.

I have IIS installed including the SMTP server, but I still cant send any mail through my app.
Is it possible for my IT department to restrict SMTP mail?

I just want to connect to my SMTP server on my PC from my PC and send an email to myself (which will go via the Exchange server at work).

why dont you use sockets to send the mail? (vb you would use somthing like WinSock, VB.NET [i believe] has it's own I/O Sockets)

here:
http://www.yuki-onna.co.uk/email/smtp.html

That is what I am doing.
I am wondering if the SMTP is configured wrongly or if I am typing in the wrong address
Is there a default name for your local SMTP server using IIS?