First, this is a very nice program, thanks for taking the time. Here are my issues with it:
1. I tried to send to about 750 address'. After about 300 or so, the program crashes. I re-ran it and it processed about 300 more and then crashed again. The second time, I noticed that it was using what seems to be a lot of memory. Task manager showed almost 1gig of ram. (memory leak?)
2. I am also having html issues. When I make an html message and send it, desktops seem ok with it, but I have some mobile users and they see the plain html...any ideas?
again, thanks for the effort.
Sorry, one more thing.
I noticed that you use the machine name in the HELO statement. This is a problem and causes a lot of 504 errors (helo command rejected: need fully-qualified hostname) is there a way to set what name you use?