So the good news is that this version will indeed support negotiating TLS1.2 !!! That is awesome and thank you developers!
The bad news is that when you install a Cert with a SHA 256 Hash and it negotiates with a SMTP server that utilizes a newer TLS 1.2 cipher suite such as TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256 will cause the following error:
[2015.08.18] 03:19:55 [x.x.x.x][X] Exception negotiating TLS session: System.NullReferenceException: Object reference not set to an instance of an object.
[2015.08.18] at MailService.TcpServerLib.Common.PooledTcpItem.ConvertToSSL(IPBindingPort setting, Log log, String sessionId)
[2015.08.18] at MailService.TcpServerLib.Common.PooledTcpItem.ConvertToSSL(IPBindingPort setting)
[2015.08.18] at MailService.TcpServerLib.SMTP.SMTPSession.#W8()
Basically it will negotiate TLS 1.2 just fine but if it is asked to use a cipher suite introduced with TLS 1.2 it breaks down and cries uncle...