osascript -e 'tell application "Mail" to get name of every account'

osascript -e 'tell application "Mail" to count (messages of inbox whose read status is false)'

osascript -e 'tell application "Mail"
  set recentMsgs to messages 1 thru 10 of inbox
  repeat with msg in recentMsgs
    set msgInfo to "From: " & (sender of msg) & " | Subject: " & (subject of msg) & " | Date: " & (date sent of msg)
    log msgInfo
  end repeat
end tell'

osascript -e 'tell application "Mail"
  set msg to message 1 of inbox
  return "From: " & (sender of msg) & "\nSubject: " & (subject of msg) & "\nDate: " & (date sent of msg) & "\n\n" & (content of msg)
end tell'

osascript -e 'tell application "Mail"
  set foundMsgs to (messages of inbox whose subject contains "keyword")
  count foundMsgs
end tell'

osascript -e 'tell application "Mail"
  set foundMsgs to (messages of inbox whose subject contains "keyword")
  if (count foundMsgs) > 0 then
    set msg to item 1 of foundMsgs
    return "From: " & (sender of msg) & "\nSubject: " & (subject of msg) & "\nDate: " & (date sent of msg) & "\n\n" & (content of msg)
  else
    return "No messages found"
  end if
end tell'

osascript -e 'tell application "Mail"
  set foundMsgs to (messages of every mailbox of every account whose subject contains "keyword")
  -- Note: this can be slow across many accounts
end tell'

osascript -e 'tell application "Mail" to get name of every mailbox of account "Gmail"'