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Good info.
I've only just enabled SendGrid (an hour ago).
I've shifted notifications to it too... and amusingly broke all links because I have HSTS enabled on microcosm.app and the email click tracking (which I use to drive an alert in case the system goes down) broke because SendGrid don't do HTTPS on their redirects (I CNAME them).
As for Auth0 and email deliverability... this is why SendGrid is now in the mix. It will take a little while for the new IP I've bought to warm up and for everything to settle down. Until then, some systems will defer delivery for a while. I'm going to increase the validity period of the code.
Velocio
Email from auth0 looks good from a DKIM/SPF point of view, at least my MTA is happy with it. I guess that's more sendgrid than microcosm, but still it looks alright to me.
auth0 works for me on Firefox/iceweasel on Debian unstable as well as opera-developer on the same. When I ran email via greylisting it took so long for the email to arrive that the auth0 code had expired, but I'm not sure I can blame auth0 for that.