@firstname.lastname@example.org is SMTP strictly necessary to run a pod? sometimes sign-ups don’t quite work when it’s disabled, recalling from my earlier experience at hashbang
@email@example.com no SMTP configuration is completely optional. I don’t have it set up on my pod and have had no issues with sign-ups.
Do the logs show any errors whilst a user is signing up?
@firstname.lastname@example.org at least not on this account, so I guess I’m good.