Sorry for rehashing an old thread, but this is an issue for me as well. Port 587 is a standard SMTP port that should be acceptable, but I haven't found any way of configuring the software to use that port instead of 25. As Cagil mentioned, the e-mail just doesn't work, but there are no errors logged anywhere which makes it extremely difficult to troubleshoot. I've tried using just our smtp server name on it's own as well as in the format smtpserver:587, but it just won't send mail.
I can't reconfigure the SMTP server, so what can be done to configure PPM to use the proper port?