“Watch for reply” is a really useful feature, but there are a couple of suggestions I would make to improve it.
1. Be able to change the folder name “Unreplied” or change the name to “Watched”.
I think the name is not clear and is confusing.
To me, this name could mean I have not replied to an e-mail, not necessarily that someone hasn’t replied to me.
Also, based on its name, I would expect it to show any e-mail that has not been responded to.
(On this note, it would be useful if there was a feature to show all e-mails not replied to, whether I have not or someone has not replied to me. Some clients have this as a search filter. It would be great to see it in eMClient.)
Or, if it needs to be a set name, why not call it “Watched”?
2. Have a column to show watched e-mails.
That way, in the e-mail List pane, you can see which e-mails are being watched.
3. Have a note/icon on the e-mail saying it is being watched.
Similar to the “You replied to this e-mail on…” note.
4. An icon on the email List pane when there is no column.
Similar to the tracking icon or attachment icon.
I hope these things can be considered. Hopefully they should not be too difficult to achieve.