The question sometimes arises from organizations as to what can be done to ‘fix’ emails that fail authentication when going through a forward. The short answer is that there is nothing realistically that can be done to guarantee forwarded email authenticate properly. To fix the issue would today require working with each forwarding entity to try to get them to update their systems to forward emails without breaking authentication (which may not even be possible). This is not realistic. Some things to be aware of:
What to do about Forwards
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