I'm wondering the same thing because the Ninja website says the following: (But GoDaddy hasn't seemed to answer the question) Let me say that again for the record: Ninja Forms does not send email. Neither does WordPress. Both ourselves and WordPress are involved, but neither of us send email. The actual sending of email is handled by your web host. The process looks like this: Your Ninja Forms email action triggers on form submission. Ninja Forms passes the email action data to WordPress. WordPress relays the email action data to your web host. Your web host takes the email action data, processes it, and sends it as an email. 90%+ of problems stem from #4: the web host actually sending the email. There are a variety of reasons this is the case, and it’s not necessarily your web host failing you. In a world where spam email is an ever present daily problem, some of the actions taken by web hosts to fight spam causes unintentional collateral damage.
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