How do I fix connection to server failed?

Methods to Fix iPhone error ” Cannot Get Mail: The connection to the server failed “

1. Method 1: Check the Internet connection on iPhone. …
2. Method 2: Restart your iPhone. …
3. Method 3: Delete and re-enter mail account on iPhone. …
4. Method 4: Change the mail account password on iPhone. …
5. Method 5: Move emails to different folder.