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Easiest way is to run IISCrypto<br />
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<a href="https://www.nartac.com/Products/IISCrypto" rel="ugc">https://www.nartac.com/Products/IISCrypto</a><br />
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It tells you what protocols are currently being used and allows you to enable/disable them. Just run it on your exchange servers but do so with cation if you are making changes.
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any other way I can check on my exchange server or smtp gateway
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it says in header &quot;Microsoft SMTP Server (TLS) don't know what version??
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Microsoft SMTP Server (TLS) id<br />
&nbsp;14.3.301., what does this mean
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I believe that means it's using 1.0 but I'm not 100%. Mine shows version=TLS1_2.
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Two ways check the send connector protocol logs, you will see something like TLS1-1 and so on<br />
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Collect network trace look for TLS handshake and to verion being used.<br />
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Also on exchange server check these keys are enabled or not, usually it is recommend to enable all TLS Verizon if you are not on latest update.<br />
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<a href="https://support.quovadisglobal.com/kb/a433/how-to-enable-tls-1_2-on-windows-server-2008-r2.aspx" rel="ugc">https://support.quovadisglobal.com/kb/a433/how-to-enable-tls-1_2-on-windows-server-2008-r2.aspx</a><br />
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Don't make any changes just verify if all TLS versions are enabled, in Windows 2008r2 it is not enabled by default
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how do I know I am using tls1.2 or 1.1 in email<br />
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I have exchange 2010 sp3
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how do I know I am using tls1.2 or 1.1 in email

I have exchange 2010 sp3

exchange

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.