EDIT: This question is pointless, except as an exercise in red herrings. The issue turned out to be a combination of my idiocy (NO ONE was being emailed as the host was not being specified and was incorrect in web.config) and the users telling me that they sometimes got the emails and sometimes didn't, when in reality they were NEVER getting the emails.
So, instead of taking proper steps to reproduce the problem in a controlled setting, I relied on user information and the "it works on my machine" mentality. Good reminder to myself and anyone else out there who is sometimes an idiot.
I just hit something I think is inconsistent, and wanted to see if I'm doing something wrong, if I'm an idiot, or...
MailMessage msg = new MailMessage();
msg.To.Add("[email protected]");
msg.To.Add("[email protected]");
msg.To.Add("[email protected]");
msg.To.Add("[email protected]");
Really only sends this email to 1 person, the last one.
To add multiples I have to do this: msg.To.Add("[email protected],[email protected],[email protected],[email protected]");
I don't get it. I thought I was adding multiple people to the "To" address collection, but what I was doing was replacing it.
I think I just realized my error -- to add one item to the collection, use .To.Add(new MailAddress("[email protected]"))
If you use just a string, it replaces everything it had in its list. EDIT: Other people have tested and are not seeing this behavior. This is either a bug in my particular version of the framework, or more likely, an idiot maneuver by me.
Ugh. I'd consider this a rather large gotcha! Since I answered my own question, but I think this is of value to have in the stackoverflow archive, I'll still ask it. Maybe someone even has an idea of other traps that you can fall into.