I don't think `git contacts` is available by default? ... $ git contacts git: 'contacts' is not a git command. See 'git --help'. ... ... $ git send-email --to=kipras@xxxxxxxxxx --cc-cmd='git contacts' 0001-TEMP.patch 0001-TEMP.patch git: 'contacts' is not a git command. See 'git --help'. (cc-cmd) failed to close pipe to 'git contacts' at /opt/homebrew/opt/git/libexec/git-core/git-send-email line 2021. ...