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I don't think message content is weighted very heavily in modern spam filters...

Things like IP reputation, sender reputation, and various SPF-like headers are far more important.

It makes sense in itself, but then why do you think the second email went through in this case, considering no factors other than content didn't change?

well this is the 2nd email from the same server, and the first was viewed by the user for 20+ seconds and not deleted, so probably not spam...

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