TO EDIT YOUR SETTINGS IN WINDOWS 10 MAIL (POP)
1
In the Mail app, select the settings icon.

2
Underneath Settings, tap Accounts.

3
Underneath Accounts, tap The account you want to edit

4
Click "Change Mailbox and Sync Settings"

5
Click "Advanced Mailbox Settings"

6
The following amendments need to be made
Incoming Mail Server | |
FROM: | pop.********.*** |
TO: | pop.iomartmail.com |
FROM | smtp.********.*** |
TO: | smtp.iomartmail.com |
Click Done
pop.iomartmail.com
smtp.iomartmail.com

7
Click Save