postfix only newer TLS versions
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@ -37,6 +37,8 @@ smtpd_tls_auth_only = yes
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smtpd_tls_cert_file = /var/lib/dehydrated/certs/${hostname}/fullchain.pem
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smtpd_tls_key_file = /var/lib/dehydrated/certs/${hostname}/privkey.pem
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smtp_tls_security_level = may
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smtpd_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
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smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
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smtpd_restriction_classes = mua_sender_restrictions, mua_client_restrictions, mua_helo_restrictions
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mua_client_restrictions = permit_sasl_authenticated, reject
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