Open the Mail app:

Step 1.

Check that you are in the highdown account inbox. If not, tap the top left menu symbol…

And tap the highdown account

Step 2.

Now, in the highdown inbox, tap the top left menu symbol…

then tap on the top right-hand settings symbol...

Tap on the highdown account...

Swipe up...

tap Server settings...

Check Email address,

Username (same as Email address),

Password

Check mail.interdns.co.uk as the Incoming server,

IMAP server setting

Check TLS as the Security type

Check 143 as the Port

Swipe up...

Check Outgoing server settings:

Check smpt.interdns.co.uk as the SMPT server

Check TLS as the Security type

Check 25 as the Port

Check Authentication required before sending emails turned ON

Re-enter Username and Password

Done!