PyroX, when you run your script do you see a child sendmail process recieve the mail? If so does it go away after a few seconds? If it doesn't that would signify that something is keeping the connection open. You may want to look at the script that is sending the mail or at the local server. There is a setting in the sendmail.cf (about line 303 depending on what is compiled into it) that looks like this:

O SuperSafe=True
[download]

If you change it to false it will not queue your mail. It will start relaying it as soon as it starts recieving it. You will probably not want to do this if the machine is on a public network.

--BigJoe

Learn patience, you must.
Young PerlMonk, craves Not these things.
Use the source Luke.