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