For security reasons we have turned off SSLv3 on POP connections (port 995) today. That means we now only allow TLS 1.0, TLS 1.1 and TLS 1.2 on POP connections.
As a Runbox user you should not have to do anything — your email program should already support TLS and use it automatically. If not, please make sure your email program is up-to-date.
Apple Mail users: Please see our notice regarding APOP.
If you do experience any problems, please contact Runbox Support.