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Not sure if I'm being really thick but I can't see a place to change the brand icons? Haven't found anything with a search. If no one's asked before surely I'm missing something.
The brand icon uses the 'From email' domain's favicon.
Good question by the way, you are the first to ask!
https://getfavicon.appspot.com is not finding my favicon it seems.
Perhaps it's not looking at the links in the head?
<link rel="shortcut icon" href="/gjfav.ico?v=3" type="image/x-icon" />
<link rel="icon" href="/gjfav.ico?v=3" type="image/x-icon" />
I'm going to copy and paste to favicon.ico and see if that works.