You should be able to update it by editing the "From address" at Confluence Admin>Mail Servers:
However, it did not work for me, so I opened a bug: From address ignored in Mail Server setup
Please let me know if it works for you as it could be something with my email setup and not with Confluence.
Hello Community, Jessica here from the Confluence product marketing team! Today I wanted to get your takes on project planning –– what works, what doesn’t, how do you know if you’re doing it r...
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