In case you are running e-mail server with Postfix, here is configuration improvement to use stronger SSL and TLS ciphers when connecting to secure SMTP as suggested by Switzerland-based secure mail provider ProtonMail.
I prefer running my servers on
Then somewhere in the bottom paste following:
smtpd_tls_mandatory_protocols = SSLv3, TLSv1 smtpd_tls_mandatory_ciphers = high
And don’t forget to restart Postfix:
/sbin/service postfix restart
That’s it! Happy and secure e-mailing 🙂
P. S. I haven’t yet got an invite to join ProtonMail service, still looking forward.
Update 2014-08-31: got invite to test ProtonMail service with 100 MB account. In case you are using it already, say me hello at email@example.com. Note – this address is just an addition to