[Users] Next following message

[Paul]

On Thu, 1 Oct 2020 17:53:30 -0700
sylpheed at 911networks.com wrote: 

> I have an email in the sent folder. How do I find their reply (it
> could have gone in my 80+ folders)?

There's no automatic way to do it, but it's possible.

In your Sent folder, open the message, and display all headers.
Find the header In-Reply-To, copy its value.

Then use an 'Extended' Quick Search, using:

messageid matchcase "COPIED STRING HERE"

with regards

Paul