Hi. I have the default SMTP server running in IIS6, and I'm trying to send emails through it from an ASP.NET page. Every now and then an email will be sent properly, but usually the emails are not sent, even when the email message is identical to one that did work. Even stranger is that the process is not noticeably failing: I'm not getting any error messages, and the unsent messages aren't showing up in the Badmail folder. In fact, all messages, sent and unsent, are not showing up in any of the folders in mailroot.
In troubleshooting this, I stopped and started Simple Mail Transfer Protocol service, and I poked around in the Properties for the Default SMTP Virtual Server in IIS and set the Non-Delivery reports to be sent to my email addres, but I haven't received those either. What else should I do?