Every now and again we run into issues with WordPress where the email functionality has stopped working. This is usually the result of corrupted core files and/or plugin conflicts. Easy enough to fix: disable plugins or upload a fresh copy of the software and you’re good to go.
There are those times though that it takes a bit more investigating than you’re used to. A great little tool is called “Check Email”, another plugin, which allows you to test your email settings. It really doesn’t do much other than sending you a test email but it can be a big time saver if you have to send mail via custom script or multi step plugin options.