On Wednesday, 14 Feb 2018 at 20:19, Nicolas Goaziou wrote:

> My MUA is Gnus, configured to not display images, because I usually do
> not want to see them.

My MUA is Gnus as well.  Images don't appear initially for me either but
switching to the HTML part shows them ("b", gnus-article-view-part).  I
am saying this for Kaushal's benefit: your email was okay as such but
many of us will not see the images by default.