How configure TLS only between two domains in Exchange Server 2013

I need configure in Exchange Server 2013 communication TLS only between 2 domains. The communication is with our server and other server "client".

Best regards.
ccedilloAsked:
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AkhaterConnect With a Mentor Commented:
If that's the receiving side smtp server then the only way is to contact the it responsible for that domain and let them enable tls on their server. Nothing to do on exchange side
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AkhaterCommented:
Opportunistic tls is enabled by default on all new(ish) email servers, so chances are you don't need to do anything tls is already being used
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ccedilloAuthor Commented:
Hello Akhater. Thanks for your answer.

I am check in www.checktls.com and the result is:

test stage and result : TLS is not an option on this server

[000.070]  Connected to server  
[000.216] <-- 220 smg.macf.com.mx ESMTP mail.macf.com.mx  
[000.216]  We are allowed to connect  
[000.216] --> EHLO checktls.com  
[000.287] <-- 250-smg.macf.com.mx says EHLO to 216.68.85.112:53446
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250 SIZE 35840000  
[000.288]  We can use this server  
[000.288]  TLS is not an option on this server  
[000.288] --> MAIL FROM:<test@assuretls.checktls.com>  
[000.360] <-- 250 2.0.0 MAIL FROM accepted  
[000.360]  Sender is OK  
[000.360] --> RCPT TO:<ccedillo@macf.com.mx>  
[000.436] <-- 250 2.0.0 RCPT TO accepted  
[000.436]  Recipient OK, E-mail address proofed  
[000.437] --> QUIT  
[000.508] <-- 221 2.3.0 smg.macf.com.mx closing connection
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Simon Butler (Sembee)ConsultantCommented:
If the other side or you require the use of TLS, then you need to configure Mutual TLS. That ensures that the traffic goes over TLS and is unable to fall back. While it is true that Exchange does opportunist TLS, that allows fall back.
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