New answers tagged email-forwarding
You can check your Outlook.com mailbox settings. You can choose to Don't Forward . This setting will not forward your emails to any address. If you want to send incoming emails to other address (you can specify list of addresses), choose Forward your mail to another email account option. For your concern, you should choose option 1.
This question has been answered here, but I'm unable to close it because of the bounty. In short, you may use Gmail's SMTP server for your alias address, as long as you have enabled two-factor authentication.
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