Changing your username in Outlook 2019

Changing your Outlook username wthout the domain to the full This email address is being protected from spambots. You need JavaScript enabled to view it..

Note: Other versions of Outlook will have similar settings, but accessing this information may be in different locations. Google your version of Outlook for that information.

From Outlook 2019: 

Open Outlook and select File from the top menu.

1. If you have multiple accounts/emails, make sure you've selected the correct account.
2. Click on Account Settings and choose Server Settings.

3. Check and change User Name if needed. You should be using your full Email Address here. 

4. Click on Outgoing mail. 
5. Check "My outgoing (SMTP) server requires authentication"
6. Select "Use same settings as my incoming mail server"

Click on Next and Outlook will test and change the settings. Done!