Setting up TLS 1.2 on Zimbra desktop 7.3.1.13063 Win10

[c_c]

Using Zimbra desktop 7.3.1.13063 running on Win10; how is setting up TLS 1.2 only performed?
All the guides seem to make reference to the ZCS rather than the desktop version.

[mhammett]

I'm looking for TLS on Zimbra Desktop as well.

[Lewis-H]

For more info on SASLauthd, please see the following:
ZCS saslauthd.conf.in sample
Create a text file mapping which name/password should be used for each given outbound destination:

echo mailrelay.example.com username:password > /opt/zimbra/conf/relay_password
Create a postfix lookup table:

postmap /opt/zimbra/conf/relay_password
To test that the lookup table is correct, the following should return username:password:

postmap -q mailrelay.example.com /opt/zimbra/conf/relay_password
Configure postfix to use the new password map:

postconf -e smtp_sasl_password_maps=hash:/opt/zimbra/conf/relay_password
On 8.0:
zmlocalconfig -e postfix_smtp_sasl_password_maps=hash:/opt/zimbra/conf/relay_password
On 8.5 and later:
zmprov ms <server> zimbraMtaSmtpSaslPasswordMaps lmdb:/opt/zimbra/conf/relay_password
Configure postfix to use SSL authentication:

postconf -e smtp_sasl_auth_enable=yes
On 8.0:
zmlocalconfig -e postfix_smtp_sasl_auth_enable=yes
On 8.5 and later:
zmprov ms <server> zimbraMtaSmtpSaslAuthEnable yes