We have set up rules to perform actions ( mainly send emails to relevant users ). So far these rules based emails were sent from user account SharePoint online <no-reply@sharepointonline.com>, Just as expected
since today the emails are sent with one of the user as "email from" instead of no-reply@sharepointonline.com email,
Below are the rules, SharePoint list ==> automate==> Mange Rules
Here is the screenshot of rules:

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