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

[code lang=”shell”]nano /etc/postfix/[/code]

Then somewhere in the bottom paste following:

[code lang=”shell”]smtpd_tls_mandatory_protocols = SSLv3, TLSv1
smtpd_tls_mandatory_ciphers = high[/code]

And don’t forget to restart Postfix:

[code lang=”shell”]/sbin/service postfix restart[/code]

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 Note – this address is just an addition to