If you update/change your domain email password via webmail, it is important you update the password in your win10 mail app asap.

1. click the mail icon (blue envelope)
2. Click the settings gearwheel > manage accounts > click the email account
3. In the pop up window, change the Password in the password field and click save.

If you have outlook on your phone, don’t forget to update that too.

**********

This is enough to update the account. If you need to change the incoming/outgoing server settings,

Follow steps 1-2 as above then choose:

Change Mailbox Sync settings – Options for syncing your content.

Here you can choose how often this email app downloads your mail from the server, how long you want it to go back, you can change your display name and switch the sync settings on or off via the toggle.

Click Advanced mailbox settings – Incoming and Outgoing mail server info to change the server and port settings (warning! only do this if you have been asked to by your service provider)

For secure mail, all 4 checkboxes should be ticked.