I was able to fix mine by going into Edit - Preferences - Send forms - My preferences - Edit
Make sure email ID is correct. Make sure email provider is correct. (outlook/hotmail/live) Those were okay. The
update changed the SMTP Server Details in the box area. The server name had changed and now showed "smtp.live.com" I changed this back to my correct server"smtp.office365.com" The port was still correct and the box was still checked. If you are unsure of your email server, I found this in my email in View All Outlook Settings and it was listed in the Email tab under Sync Email.
I hope this helps!
