Geht einfach per script

code in den (Apple)Script Editor kopieren, in der ersten Zeile macfix.de durch die gewünschte Domain ersetzen und script starten. Das Resultat ist eine Textdatei auf dem Schreibtisch mit Dateiname AddressesFromDomain<domain>.txt

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property domain : "macfix.de"
 
tell application "Contacts"
  set mailAddresses to {}
  repeat with aPerson in (get people)
    repeat with aMail in (get emails of aPerson)
      if value of aMail contains domain then set end of mailAddresses to value of aMail
    end repeat
  end repeat
end tell
set fileName to (path to desktop as text) & "AddressesFromDomain" & domain & ".txt"
 
set {TID, text item delimiters} to {text item delimiters, return}
set mailAddresses to mailAddresses as text
set text item delimiters to TID
try
  set fileDescriptor to open for access file fileName with write permission
  write mailAddresses to fileDescriptor
  close access fileDescriptor
on error
  try
    close access file fileName
  end try
end try