Where does this utility exist? I can't find it on my macOS installation.

A lot (all?) has been cleared out in Monterey. I can’t find smtpd or xattr’s scripts that required the previous version. I think whatever remained before 12.3 were Automator’s py scripts. But I don’t know what scripts those were.

Mine does seem to contain `/usr/bin/smtpd.py` with a modified date of January 22nd. It's an installation that's been updated through a number of versions of macOS, though.

Ah, I see...

It contains the following shebang:

  #!/System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python -R

Which continues to work since it's a system framework.

I'm running Monterey on a brand new machine (no updates from older versions of macOS) and mine is in /usr/bin/.

It seems that Spotlight doesn't index that folder, hence why I didn't find it in my quick search.

I see it now, but it uses a shebang that points to the system framework python:

  #!/System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python -R