Find all mailboxes that received emails with specific subject

[qakos]

Hi, firstly, I want to say thank you for this great tool!
Maybe somebody asked you early, about search mailboxes by email subject.
In my case, I need to find all mailboxes that received email with "some specific" subject.
Some alternative tools have this feature, but I don't like them ))
It will be great if you can realize this feature!

[jhillyerd]

This would be a useful feature, but it is not feasible to implement with Inbucket's current disk storage engine. If someone feels like tackling this, they'd need to implement indexes of mailboxes & message headers.