Can't send email from AT&T iPhone 6 via cellular
I have an iPhone 6. Until recently (2-3 months ago?) email was working fine. Now, if I am away from wifi, or if I turn wifi off on the phone, I cannot send email on LTE. Receive is fine. The outgoing email gets stuck forever in the outbox and I get an error saying the server rejected the receipient. But - if I come back home, or turn wifi back on on the phone, the email will send immediately. I use several frontier.com email addresses and it is the same for all of these. My wife's iPhone 6s behaves the same way. My gmail email sends and receives just fine.