Do you have available somewhere the graphics / banners that are part of the new user welcome email in English? The stock ones are not.
What do you see? I noticed some issues with my community welcome message the other day (the one sent as a private message), and I had to remove a funky character that was in the image URLs. I thought it was just me.
This is the default new user welcome email message body:
Those are the two issue images I see so far. They’re part of the default package I received when I signed up for a digital ocean discourse droplet, default load.