The golang-gopkg-mail.v2 package ships upstream code from 2021 and
appears unmaintained.  It has no reverse dependencies in Debian.

https://tracker.debian.org/pkg/golang-gopkg-mail.v2

The upstream project was archived in 2024:

https://github.com/go-mail/mail

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:~/dpkg/golang-qa-find-zombies$ ssh mirror.ftp-master.debian.org dak rm -Rn golang-gopkg-mail.v2
Will remove the following packages from unstable:

golang-gopkg-mail.v2 |    2.3.1-5 | source
golang-gopkg-mail.v2-dev |    2.3.1-5 | all

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

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

Checking reverse dependencies...
No dependency problem found.

jas@frallan:~/dpkg/golang-qa-find-zombies$