I have an application that both received and sends email. As a feature, I want to set "References" SMTP header in order to maintain correct logical message grouping by email clients. It seems that while the code encounters no errors in setting the header (confirmed with debug output) it never materializes on the client. I can't seem to find any documentation regarding "References" SMTP header in GAE. I realize it's a non-standard header, but there does not seem to be a restriction on which headers we are allowed to set.
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