I would not be so broad with that. I have 49 messages in my personal
archives with X-MC-User headers, none of which I have classified as spam.
Bill, do you see multiple X-MC- headers in the mails that come thru
MailChimp?
As in, "multiple many" or "multiple 2 or 3"? Or just the Users header?
I can't tell from the MailChimp documentation whether the headers will be
generally filtered from the final email message, or passed through. The
majority of them are instructions to MailChimp to do something in either the
headers or body of the message, so really it makes little sense to leave
them in the final message.
I can write rules to detect bogus values for quite a few of the headers, but
the allowed text for a lot of the headers is moderately complicated, so gets
to be a big and expensive regex. It would be a lot easier to just add points
if there are say 3 or more X-MC headers in a row. But of course that is no
good if MC does just pass all the direction headers through to the final
messages it generates.
Thanks,
Loren
