As a gmail user, I see the <Athena> avatar, but only if I hover my mouse over your name. This mailing list shows red question marks for almost everyone who uses the list to me in the gmail web interface and android web app. Every question mark stands for "Gmail couldn't verify that [domain] actually sent this message (not a spammer)."
Your message has the following SPF/DKIM/DMARC, see
https://puu.sh/IEUNM/86aafc1271.png and as such, it should always show warnings and nothing else. This is not your fault, of course.
If I feed your messages header to the Google Messageheader-tool (
https://toolbox.googleapps.com/apps/messageheader/analyzeheader), it shows the message going through the dreamhost etc. and that seems to be why google can't trust it.
see
https://puu.sh/IEUZr/e37fa6b7d2.png...yet James Landau uses Yahoo Web interface and that doesn't get caught up in dreamhost's postfix at all and because of that (presumably) I can see James' icon and all.
