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

CentOS, so to edit Postfix configuration file I hit

nano /etc/postfix/main.cf

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 gytis@protonmail.ch. Note – this address is just an addition to

my primary contracts.