Sometimes you need to make a change to your email account settings. If you have a new password, if your email provider has asked you to change settings, or if you're having problems with sending and receiving email, you can change your email account settings through Mail in the Windows Control Panel, or from Outlook.

How to update or change your email settings from Mail in Control Panel
You'll need to know your account type, the incoming and outgoing server names, and the SSL and port settings for your email account.

1. Open the Control Panel.
Windows 10: In the search box on the taskbar, type control panel, and then select Control Panel.
Windows 8.1: Type control panel in the search box, and then select Control Panel.
Windows 7: Click the Start button, and then click Control Panel.

2. In Control Panel, search for and open the Mail icon.

3. On the Mail Setup - Outlook window, click Email Accounts...

4. On the Account Settings window, select the account you're trying to troubleshoot and select Change.

5. On the Change Account window, check the Incoming mail server and Outgoing mail server settings against those from your email provider or the reference article. If it's different, update the settings.

6. Under Logon Information, verify you're using the correct User Name and Password associated with your email account.

7. Click More Settings...

8. On the Internet Email Settings window, select the Advanced tab.

9. Under Server Port Numbers, compare the Incoming server (IMAP) and Outgoing server (SMTP) numbers to those provided by your email provider or from: https://support.microsoft.com/en-us/office/pop-and-imap-email-settings-for-outlook-8361e398-8af4-4e97-b147-6c6c4ac95353. If they don't match, manually change them.

10. Additionally, compare the encryption types (next to Use the following type of encrypted connection) for both Incoming and Outgoing servers as well and, if they don't match, manually change them.

11. Click OK, and then click Test Account Settings on the Change Account window.

12. On the Test Account Settings window, check if you have green check marks or red markers:
Red markers indicate some or all settings are incorrect. Check your settings and test again. If the test fails, contact your email provider to verify the information.
Green check marks indicate a successful test. Click Close, and then click Next and Finish on the Change Account window. Your email should be properly configured.

Support article: https://support.microsoft.com/en-us/office/change-or-update-email-account-settings-in-outlook-for-windows-560a9065-3c3a-4ec5-a24f-cdb9a8d622a2?ui=en-us&rs=en-us&ad=us

What are IMAP and POP: https://support.microsoft.com/en-us/office/what-are-imap-and-pop-ca2c5799-49f9-4079-aefe-ddca85d5b1c9