for DANE, the smtp_tls_mandatory_protocols setting seems like it also needs to be set (unlike the cipher settings, this isn't documented to be in addition to the non-mandatory setting)
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@ -160,6 +160,7 @@ tools/editconf.py /etc/postfix/main.cf \
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# now see notices about trusted certs. The CA file is provided by the package `ca-certificates`.
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tools/editconf.py /etc/postfix/main.cf \
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smtp_tls_protocols=\!SSLv2,\!SSLv3 \
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smtp_tls_mandatory_protocols=\!SSLv2,\!SSLv3 \
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smtp_tls_ciphers=medium \
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smtp_tls_exclude_ciphers=aNULL,RC4 \
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smtp_tls_security_level=dane \
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