Update Mail Server Settings in Outlook

Open Outlook on your device.

Click on File in the header.

Select the account you want to alter from the dropdown. Then click Accounts Settings and then Server Settings.

Update the password and change the server to imap.stackmail.com - then ensure the port is set to 993 and the encryption method is SSL/TLS. Then click Outgoing mail.

Update the password and change the server to smtp.stackmail.com - then ensure the port is set to 465 and the encryption method is SSL/TLS. Then click Next.

It'll then show the account has been updated successfully, so just click Done.