First off, my apologies, I made a couple of typos in my previous message to you – I meant to ask you if your publication is on a subdirectory.
With that clarified, is your publication in fact on a subdirectory? Because if it’s anything like my subdirectory-using in-development publications, the publication icon won’t appear in the newsletter emails anymore than it does on the test screen.
Otherwise, no, I don’t know anything about how the text size appears in Gmail, although there was another thread mentioning this and where it appears the problem fixed itself.