The golang-github-emersion-go-imap-idle package ships upstream code from
2020 and appears unmaintained.  It has no reverse dependencies in
Debian.

https://tracker.debian.org/pkg/golang-github-emersion-go-imap-idle

The upstream project was archived in 2021:

    This extension has been merged into go-imap. Use built-in support
    instead of this repository!

https://github.com/emersion/go-imap-idle

This removal request is part of a larger batch to remove 100+ unused
golang-*-dev packages from Debian.  I believe the QA cost associated
with keeping all of them is larger than the cost of (hopefully extremely
rare) re-introduction of any accidentally removed package if there is
ever any future need for it.  Meanwhile, I don't think it is useful to
keep this package in Debian.

/Simon

jas@frallan:~$ ssh mirror.ftp-master.debian.org dak rm -Rn golang-github-emersion-go-imap-idle
Will remove the following packages from unstable:

golang-github-emersion-go-imap-idle | 0.0~git20201224.6f42b90-2 | source
golang-github-emersion-go-imap-idle-dev | 0.0~git20201224.6f42b90-2 | all

Maintainer: Debian Go Packaging Team <team+pkg-go@tracker.debian.org>
------------------- Reason -------------------

----------------------------------------------

Checking reverse dependencies...
No dependency problem found.

jas@frallan:~$