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Re:Ask HN: Best hosted alternative to Google Workspace for e... by hda111 on Sunday February 06, 2022 @06:46AM (#30231669)
I don’t think they can implement such a check without breaking changes.
Re:Ask HN: Best hosted alternative to Google Workspace for e... by 15characterslon on Sunday February 06, 2022 @07:48AM (#30232043)
And that's why we shouldn't fix bugs anymore? https://xkcd.com/1172/

Fixing this would only affect users who send emails "from" other users email addresses, basically users who commit fraud.