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In order to send securely to our server the sending host must be using TLS 1.2 or higher. Here are the operating systems and browsers that support the TLS 1.2 Security Protocol.
Windows OS
Windows Vista & Windows Server 2008, Windows 7 & Windows Server 2008 R2, Windows 8 & Windows Server 2012, Windows 8.1 & Windows Server 2012 R2, and Windows 10 & Windows Server 2016
(source)
Mobile OS
Android Version 4.4 and newer
iOS Version 6 and newer
Browsers
Chrome Version 49 and newer
FireFox Version 31 and newer
Microsoft IE 11 and newer
Microsoft Edge
Safari Version 6 and newer