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system-sendmail allows all sendmail's to be auto-detected, including on non-NixOS systems. This is, to me, a better UX than having to manually override the sendmailPath argument. In exchange, it is a breach of retro-compatibility. Given right now I can't see any uses for sendmailPath other than what is supported by system-sendmail, I didn't keep it, but it'd be possible to allow sendmailPath to override the choice of sendmail from system-sendmail.