Links in Word for the web - Microsoft Support
https://support.microsoft.com/en-us/office/links-in-word-for-the-web-a7904d59-0bbf-456e-9653-4a11d517961f
WEBTo link to an email address, type mailto: followed by the recipient's email address, in the Address box. When a reader clicks the link, their email program will start a message, using the address in your link. Tip: To edit a link that’s already in your document, click anywhere in the link, and then select Insert > Link.
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