If you've connected another email account to your Outlook on the web account, you can choose to send email from that address. For example, you might receive a message sent to your Outlook on the web account but reply to it using your Gmail address.
To do this, you need to connect the other email account to your Outlook on the web account. See Connect email accounts in Outlook on the web to learn more.
Note: If the instructions don't match what you see, you might be using an older version of Outlook on the web. Try the Instructions for classic Outlook on the web.
Send email from a different email address
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In the compose window, select
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Select From and choose which email address you want to use.
Instructions for classic Outlook on the web
Send email from a different email address
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In the compose window, select
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Select From and choose which email address you want to use.
Change your default reply address
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At the top of the page, select
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In the Options pane, under Mail > Accounts, select Connected accounts.
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Select Change default reply address.
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Choose an address from the drop-down list, and then select Save.
