I can't send email through my AOL account on my iphone 8 or my MacBook, but I can receive through that account.
I can't send email via Apple Mail through my AOL account from my iPhone 8+ or my MacBook, but I can receive email just fine. This problem started on its own yesterday afternoon. I sent an email at 2:45 pm, but the next attempt just a few minutes later failed. I started receiving all sorts of error messages, and the email is stuck in the Outbox.
iPhone 8+ with iOS 11.2.6
MacBook Pro with MacOS 10.13.3 and Mail 11.2
iPhone 8 Plus, iOS 11.2.6