Huge weight off my shoulders

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Just select all and delete it all. If it's really important they'll email again.

I'm more of a select all, mark read type of guy, but whatever's clever

I can only load and select 100 at a time. Every year or so I attempt to tackle it but it's a sisyphus task.

If you create a rule for a specific email address, you can send it all into a folder, then mark the folder as read. Or, you know, just send all to junk

But what if I need that random e receipt from 6 years ago ???????