Get TLS/SSL for Sentora Mail

Hello, is there any updated way on getting SSL/TLS support on mails sent via RoundCube on Sentora so it doesn't either end up in spam or show a red lock icon? I read http://forums.sentora.org/showthread.php?tid=4439 but as it was posted in 2014, I'm not sure if these instructions still apply. Also, I am using my domain registrar's nameservers (not self hosted nameservers) to host Sentora. Your help is much appreciated.

Thanks.

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