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Update STARTTLS-how-to.md

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Dennis Baaten 2020-05-28 11:08:21 +02:00
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under construction/STARTTLS-how-to.md
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@ -16,6 +16,7 @@ Under construction
# Tips, tricks and notices for implementation
* http://postfix.1071664.n5.nabble.com/Disable-SSL-TLS-renegotiation-td96864.html#a96871
* Use the RFC 7919 defined DH groups: https://raw.githubusercontent.com/internetstandards/dhe_groups/master/ffdhe4096.pem)
## Implementing STARTTLS in Postfix
**Specifics for this setup**
@ -60,7 +61,7 @@ Under construction
smtp_tls_exclude_ciphers = aNULL, eNULL, EXPORT, DES, RC4, MD5, PSK, EDH-DSS-DES-CBC3-SHA, EDH-RSA-DES-CBC3-SHA, KRB5-DES, CBC3-SHA, DHE-RSA-AES256-CCM8, AES256-CCM8, DHE-RSA-AES128-CCM8, AES128-CCM8
# Enable server cipher-suite preferences
tls_preempt_cipherlist = yes
# Forward secrecy (use the RFC 7919 defined DH group:https://raw.githubusercontent.com/internetstandards/dhe_groups/master/ffdhe4096.pem)
# Forward secrecy
smtpd_tls_eecdh_grade=ultra
smtpd_tls_dh1024_param_file = /etc/postfix/ssl/ffdhe4096.pem