Can't send email over wifi? I think I have a solution
My problem was that I could receive emails over wifi, but could not send them at all, from several accounts (private domains). I have a gmail email account, but wasn't using it on this phone; however, I still have the account, and went over to gmail, logged in, and looked up the settings for sending email via Outlook or other email client - I entered the SMTP settings only into my phone for each account, leaving the POP settings alone - voila, instantly worked! I'm so happy, it seemed utterly lame to have to turn off my Wifi to be able to send an email.
Hope this helps someone! I have gotten so much great technical advice from user forums that I decided it's time for me to give back (now that I actually may have something to contribute
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Thanks!