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Why would it be a very long To header? It’s not like the email headers include all 400k emails in one go.

That would be a massive privacy breach, and people here would be making a lot more noise about such a large email database being leaked.

I agree, but couldn't think of another explanation related to that email.

Drunk Microsoft programmer who developed Outlook

Attempted to reach the Ballmer peak but went too far

It's a personal testimony. Immaterial to the main point of the post.