Q&A Forum > > Reply To: Decoding “Full Headers” in Apple Mail, so that I may block a spoofed-domain Start a new discussion August 6, 2021 at 9:39 am #50128 TeamKomando:JohnParticipant @264458 Hello leftblank15, Such a great question, below you will find three tools available for helping you decode the message header. Mx Toolbox Email header analyzer Google Admin toobox Messageheader Azure websites Message Header Analyzer I hope that helps you accomplish what you are doing.