Hi, > smtpd_tls_protocols = !SSLv2, !SSLv3 !TLSv1 !TLSv1.1 !TLSv1.2 !TLSv1.3
By this you basically DISABLED all tls protocols. The ! means "not". Try this: smtpd_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1 You can use https://ssl-config.mozilla.org/#server=postfix&version=3.4.8&config=intermediate&openssl=1.1.1k&guideline=5.6 for generally good defaults. Or just use postfix defaults. Hope that helps. Josef
