![]() Since the digital signature stays with the email message because it's part of the email header, DKIM works even when a message has been forwarded as shown in the following example. When you forward a message, portions of that message's envelope can be stripped away by the forwarding server. SPF adds information to a message envelope but DKIM encrypts a signature within the message header. How DKIM works better than SPF alone to prevent malicious spoofing
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