Hi @Marcin Tatara ,
Welcome to Q&A!
Before going further, please kindly understand that the Outlook tag here we mainly focus on general issues about Outlook desktop client.
According to your description, sounds like you would like to change the email address which is used to log into the Microsoft Q&A forum, right? If yes, as I know, we can link other email accounts and change email for notifications in personal profile like below. Please go to Profile>settings> Account Management and Manage email preferences, and add the linked account or change the email for notification.
By the way, if you would like to know more about Microsoft Q&A forum or have any feedback about the forum to submit, it is suggested to post your question in the dedicated “Feedback” or “FAQ & Help”. Thanks for your understanding and support.
Hope these could help!
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