I am receiving emails but sent emails are returned to my outbox. I’m using AOL on my iPad. I’ve only noticed it today. Would downloading the latest iOS upgrade have made any difference Thanks.
It appears that the email app on your iPad has lost the SMTP server settings for outgoing mail (or they've become corrupt). It's a fairly common problem across all types of device. (i.e.it happens with Outlook on Windows computers, with Android email apps and with iOS devices, such as your iPad, among others).
The simplest solution is usually to delete your email account in the app and then create it again. (You won't lose any existing mail).