I discovered yesterday that we simply don't receive the emails following form submissions on some of our forms. I have two business websites, with GF installed on both.
On my property management website, repair requests were sometimes arriving, sometimes not. This was a gmail/spam issue and I solved it with filters in gmail.
But while investigating, I discovered a bunch of entries in the backend of my General Contact form (Forms->Entries when mousing over the form area).
I've verified that the email destination email address for admin notification works (by manually sending various emails). The host checked the logs and says the emails are leaving the server after a form submission. But the form submission emails do NOT arrive in my email.
I've changed the destination email to a different one and tested again. Same outcome as before, the email address works, but admin notification to that email do not arrive. Meanwhile, the other form does work just fine, so that tells me it's not a global issue with the plugin or my server.
I don't know my next troubleshooting step. We've lost a ton of business because we simply ignored (didn't receive) inquiries from our website. Looks like the issue began in June 2012.
Any thoughts or ideas?