Hello, postfix-3.4.4 linked with openssl-1.1.1b
$ postconf tls_ssl_options tls_ssl_options = no_compression, tlsext_padding produce such log: Mar 30 21:04:12 danube postfix/smtpd[9075]: warning: unknown tls_ssl_options value "tlsext_padding" in "no_compression, tlsext_padding" while it does make no sense, I placed all options [1] and still get only errors regarding tlsext_padding: Mar 30 21:10:48 danube postfix/smtpd[9222]: warning: unknown tls_ssl_options value "TLSEXT_PADDING" in "ENABLE_MIDDLEBOX_COMPAT, LEGACY_SERVER_CONNECT, NO_TICKET, NO_RENEGOTIATION, NO_SESSION_RESUMPTION_ON_RENEGOTIATION, PRIORITIZE_CHACHA, TLSEXT_PADDING" [1] http://www.postfix.org/postconf.5.html#tls_ssl_options Andreas