To verify your email server settings are correct on your iPhone or iPad follow the steps below, this is handy to know if your provider contacts you saying that the settings are changing or that they have maybe detected you are still using old settings:

 

1)Open Settings

 

 

2)Select Mail or Apps > Mail

 

3)Select Mail Accounts

 

 

4)Select the account you would like to check from the list

 

5)Select Account Settings

 

6)On the first screen you can verify or change the Email and Description

 

7)And you can click Advanced Settings to check additional settings such as the Mail Server settings