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There are plenty of legit reasons to be mailing some of those addresses.

There were*

No, there are. I still see masses of businesses signing up for b2b products using contact@ or info@ addresses.

Indeed. Lots of businesses rely on such email addresses in their day-to-day work.

As much as I hate it one company I work with has not just a functional info@ adress, but it is the main adress they interact with everyone.

Just works.

Don't sites still use these emails to verify domain ownership?