I'm unable to troubleshoot many rules without this. To troubleshoot complex rules, I would need to be able to see the difference between "Run all rules" or "Run current rule" to execute only one rule. I would also like to be able to preview the impact of running these rules before applying them similar to how Gmail does it.

I'd love this too!

Are there any plans to introduce this? It’s the most popular request and is 4 and a half years old.

Absolutely back this! The set up process for users who are migrating from another platform is immense, so this would help so much and make the initial thoughts on Missive much more positive!

I'd like to add my vote fro this feature! Thanks

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.