[shameless plug ahead]

On 17 jan. 2014, at 01:04, Viktor Dukhovni <[email protected]> wrote:

>   /etc/postfix/main.cf:
>       # Server TLS
>       smtpd_tls_security_level = may
>       smtpd_tls_loglevel = 1
>       smtpd_tls_cert_file = ${config_directory}/smtpd-chain.pem
>       smtpd_tls_key_file = ${config_directory}/smtpd-key.pem
>       smtpd_tls_dh1024_param_file ${config_directory}/dh2048.pem
>       smtpd_tls_dh512_param_file ${config_directory}/dh512.pem


Of course one should publish the TLSA RR once the server bit has been 
configured. Easy generation:

ldns-dane -c ${config_directory}/smtpd-chain.pem create <mx.example.com> 25 
domain-issued full

e.g.

$ ldns-dane -c /usr/local/etc/postfix/postfix-cert.pem create mx.secret-wg.org 
25 domain-issued full
_25._tcp.mx.secret-wg.org.      3600    IN      TLSA    3 0 1 
3830c1286a6e1982d76b08ad04d681b5d870d8ad4374821b778b6aab462da96c



See http://www.nlnetlabs.nl/projects/ldns/ for ldns-dane (lives in most repos)

—Olaf


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