On Tue, 06 Mar 2018 13:36:36 -0500
Mimi Zohar [off-list ref] wrote:

quoted

I've heard that some maintainers are moving away from cover letters,
since they are not include in the git repo and are lost.

If I get a patch series with a cover letter that should be preserved, I apply the
series in a branch then do a no-ff merge; the cover letter can then go into
the merge commit.  There's no reason why cover letters need to be lost.

That's clever, but still it feels like a hack. 
I've try to keep cover letters as an empty commits for that but it has to be always forced when rebasing.
Not sure git has a real user friendly support for that.

Tomas