If SYIX Mailguard is keeping you are arms length, this is the fix:
- Open Mozilla Firefox (to download use this, https://getfirefox.com)
- on the address bar (very top of the screen), type "about:config" and hit enter
- Click the "accept..." bar
- On the Search Preference Name box, type "security.tls.version.enable-deprecated" (or just tls, it gets you close)
- Double Click on the line "security.tls.version.enable-deprecated", It should become BOLD and the false should change to true, and then close the screen, Mailguard will open again.