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Google now blocks spoofed emails for better phishing protection
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
What do you use for MS? I know live.com still struggles with this. Though I did create a rule that junked every email with no valid SPF record, so that helps.
It was a work issue about a decade ago. Client wanted certain emails from automation to be masked as coming from him.
Most email boxes, including Gmail, didn't have an issue. Outlook(the one that shipped with Office) laughed at it and displayed the original sender in giant bold letters.