Working in higher ed, I'd say it's more likely your university is filtering it as spam before it ever hits your inbox. Bitcoin and it's ilk are giant red flags for over-protective systems. (I'm not endorsing it, just trying to give some advice).
It's just a forwarding account, I've had it for over a decade and have never experienced it filtering spam or coinbase emails before this past month. I think it is a lot more likely that Coinbase did something with their email system. The forwarding service doesn't support TLS so it seems plausible that Coinbase wouldn't want to send email to known insecure smtp servers but who knows.
