Find Settings on your iPhone

Click on Apps (Go to next step if iPhone is not on iOS18)

Click on Mail

Click on Mail Accounts

Click on Add Account

Click on other

Click on Add Mail Account

Fill out the following fields

All Fields need to be filled out.

Protocol/Method IMAP 
Mail server: mail.neitws.com 
IMAP Port 993 
IMAP Security SSL or TLS SMTP 
Port 465 
SMTP Security SSL or TLS 
Username: Your whole email address. 
Password: Your mail password.
All fields are required.  Nothing is optional.

Once Done Click Next

Click on Save