[Dovecot] Configuring TLS 1.2

[Phillip Odam]

Hi

I'm running dovecot 2.1.6 and am trying to configure it to require TLS 
1.2. So far I've only got as far as getting TLS 1.0 going.

In the config file <dovecot root>/etc/dovecot/conf.d/10-ssl.conf, I've 
tried setting ssl_protocols to values like TLSv1.2:!TLSv1:!SSL3 but 
without any success.

Attempts to google this matter turns up results for dovecot v1.2 as 
opposed to configuring TLS 1.2 in dovecot

And having a look over the mailing list archive hasn't turned anything 
up thus far. Any pointers would be greatly appreciated.

Thanks
Phillip