Feature request: Select emails by count-from-sender

Please allow me to select emails by count? e.g. indexing all the senders and counting the emails received from each.

Here's how that would help:

When it comes to free up a few Gigs of space in disk and improve Mail's performance, selecting thousands of emails from a few big senders is more effective than attempting the crazy task of bothering ourselves with finding just undreds of emails from hundreds of small senders!

Most of the emails we'd like to be able to handle without deleting them nor letting them to fall into the spam filter's claws, are the ones we ACTUALLY suscribed to, but never had the time to recover the password, login to them, update the email preferences (most times tricky or falsely advertised as "editable", or just impossible)… a total mission certainly harder than just leting them come, and some day delete them all. After all, It's easy: selecting ALL the emails from facebook, hit delete. Done.

Now multiply that for tens of big senders, and it's a pain.

I want to select the emails by COUNT BY SENDER, and be able to slide up or down the threshold to select them.

• Slide to the left, and all emails from senders with at least 2 emails sent will be selected.
• Slide to the right and only emails from senders with e.g. 10 emails sent would be selected.
• ( Read or unread would be a good extra criteria )

That way, I don't need to go through the hundreds of small senders and wear out my brain thinking one by one whether to delete it or not, for what? to delete just a few hundred emails an hour!.

This way I can go through a few giants, and delete thousands at once.

Or is ther a way to do it (script? add-on? rule?) and I didn't find it?