I have had a contact form plugin from Jetpack working on my site without problems (I thought) but when I added a new form today and tested it I realized the form was not delivering the email to my address. I went back and checked and had not received any emails from the form since January 4th. (There were several successful emails before then.) I deactivated the plugin and installed a new form plugin and am having the same problem. I tried changing the target email address and that didn't work either.
Any ideas what can be causing this problem?