This. I've typed in one of my domain names and found out my Postfix had SSLv2 for some odd reason. No idea why, I always assumed the defaults had SSLv2 properly

This. I've typed in one of my domain names and found out my Postfix had SSLv2 for some odd reason. No idea why, I always assumed the defaults had SSLv2 properly disabled. Wrote explicit `smtpd_tls_protocols = TLSv1, TLSv1.1, TLSv1.2, !SSLv2, !SSLv3`, reloaded the daemon, ran ` openssl s_client -connect localhost:25 -starttls smtp -ssl2`, saw the negotiation failure, hope I'm good now.