There's a closed pull request on the mblaze repository

mlist to list DT_LNK elements
https://github.com/leahneukirchen/mblaze/pull/172

Description:
maildirs containing symlinks are good way to keep
track of some mails, some indexers [1] can use
this way to store the result of a query so you
can use maildir tools to do whatever you want
with the entries.

it would be convenient to use mblaze as well.

1: at least

* [mu](https://www.djcbsoftware.nl/code/mu/)

    mu find -r --learlinks --format=links --linksdir=/tmp/s

* [notmuch](notmuchmail.org/) AFAIR