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[David Bremner]

Xu Wang <xuwang762 at gmail.com> writes:

> Dear David and Suvayu,
>
> Thank you for your ideas. My goal is to do something like the following:
> notmuch search tag:reply-required and not tag:replied
>
> which was discussed here:
> http://notmuchmail.org/pipermail/notmuch/2010/002558.html
>

This recent blog report looks related to your goal:

https://tomasz.buchert.pl/blog/2015/06/14/notmuch-response/