To find out whether or not the problem is due to your email server, try to open your email account through webmail then create a test email to send and receive through webmail. If you can successfully send and receive emails through webmail, it means that the problem is either on the Mail app or iOS device you are using. Otherwise, you’ll have to deal with email client or server issues first. If you have confirmed that the problem is not on your email server, then troubleshoot the Mail app and your iOS device. The following article describes how to recover Outlook and set up an e-mail account in Outlook.
