in fact you sent this mail from Windows with a outdated thunderbird
User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:17.0) Gecko/20130307 Thunderbird/17.0.4
To be fair he he no doubt meant he sent it from postfix on fortress1.azdwiggins.com (which must be one of his home systems).
Thunderbird -> postfix with a windows desktop is not unreasonable.
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