¿Cómo escribir un servicio para obtener una cadena?

Puede añadir un comando "ejecutar applescript" a su flujo de trabajo de Automator

set the clipboard to "my_name@domain.com"
tell application "System Events"
    keystroke (the clipboard)
end tell

O

tell application "System Events"
    keystroke "my_name@domain.com"
end tell

Puede añadir este AppleScript a su flujo de trabajo de Automator para poder insertar la hora y la fecha desde el portapapeles

set AppleScript's text item delimiters to ","
set theLongDate to (current date)
set theLongDate to (date string of theLongDate)
set currentMonth to (word 1 of text item 2 of theLongDate)
set currentDay to (word 2 of text item 2 of theLongDate)
set currentYear to (word 1 of text item 3 of theLongDate)
set monthList to {January, February, March, April, May, June, July, August, September, October, November, December}
repeat with x from 1 to 12
    if currentMonth = ((item x of monthList) as string) then
        set theRequestNumber to (text -2 thru -1 of ("0" & x))
        exit repeat
    end if
end repeat
set currentMonth to theRequestNumber
set currentDay to (text -2 thru -1 of ("0" & currentDay))
set theShortDate to (currentMonth & "/" & currentDay & "/" & currentYear) as string
set CurrentTime to (time string of (current date))
set CurrentTimeandShortDate to (theShortDate & " @ " & CurrentTime)

set the clipboard to the result -- the result formatted like this 04/16/2017 @ 12:27:00 AM

-- If you only want to copy the time and date to your clip board without sending the keystrokes, Then comment out the next three lines

tell application "System Events"
    keystroke (the clipboard)  
end tell