One vote for this feature. Just add two options: "Run all rules" or "Run current rule" to execute only one rule.

Help Scout implements this with a "Apply to Previous" toggle on rule creation which seems like an elegant solution.

Yes!

Bump...this is needed, along with faster searching...

Yes please, let us apply rules to our older emails.

This would be amazing to have!

+1 - this is a huge feature for me. I have a lot of old email that needs to be organized and it's brutal to do manually, especially whenever I go make changes to the way I organize rules.

+1 for this, would like to see this

Adding my voice to the many asking for it- this would be REALLY helpful- it's the only thing I still need- missive is amazing for everything else!!!

Please do this, we need it