Travis,

WordPress email from a form does not require a mail server nor does it count as something relayed as it is typically going to the domain from which it is sent. When you moved the email to 365 the account at blueHost didnt get changed to reflect the new REMOTE mail exchanger. See the screen grab at this link…

https://www.dropbox.com/s/5oldwxuq5hr4gfq/Screenshot%202019-03-16%2020.13.14.png?dl=0

know that this form wont send to sarahnettleton.com but will send off site – try it – its using your email address..