To be clear, the iPhone SE, iPhone 6S, and iPhone 6S Plus will all be able to get to the iOS 13 update. Instead, you can keep using the phone with the latest iOS that is compatible with it, iOS 12.To get the issue resolved, you can refresh the Mail application by restarting it. Mail app possibly crashes during the system update when it is running in the background. When you add an Exchange account using ActiveSync on an Android phone, some phones will begin forwarding a copy of every SMS message (e.g., text message) that the phone receives to your email account. This is due to an issue with the way Samsung implemented its calendar application.iOS has the bad tendency to keep all configured SMTP servers (outgoing mail servers) whether they are used or not. Users of iOS (iPad, iPhone) can have trouble while setting up their Kinamo e-mail account.
How to remove old SMTP servers (problem when setting up outgoing mail server) on iOS.
