True, you need relays - but I run my own mail server, so I know the difference. Public Nostr relays vs managing postfix/spam filters/DMARC/deliverability is night and day.

Re: spam - at least with Nostr: 1) No email address exposed on your site, 2) Easy to filter/block npubs, 3) Can switch identity anytime without updating DNS/MX records. And if you DO run your own relay, it's way simpler than email.