How to amend your SMTP port in Microsoft Windows 10 Mail
Occasionally some ISPs (Internet Service Providers) will block sending mail on the default port 25. Follow the Steps in this video take you through changing your port to 587 which will then allow mail to be sent.
Step 1. In the Mail app, select the settings icon.
Step 2. Underneath Settings, tap the Accounts link.
Step 3. Underneath Accounts, tap The account you want to edit
Step 4. Click “Change Mailbox and Sync Settings”
Step 5. Click “Advanced Mailbox Settings”
Step 6. Add :587 on the end of the outgoing server and click Done or Save
Step 7. Click Save.
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