I disabled SSL v3, now a POP3 connection is failing

I disabled SSL v3.0 to protect us from the Poodle vulnerability, now I find a vendor, providing a service deemed as critical, is unable to connect over POP3. It was working until Friday, when SSL v3.0 was disabled in the registry, since then the connection
has been failing. I have deleted the registry key I created to disable this, no change. Any ideas what I need to do to get this working again?
I am using Exchange 2013 on Server 2012 R2

Hi,
Disabling the use of SSL v3 on the client will prevent all clients to use SSL v3.0 to establish SSL channels, these will use TLS instead; the consequence of this is for services (applications servers) who don’t support TLS, who only rely
on SSL 3.0 for SSL encryption => clients/browsers without support of SSL v3.0 won’t be able to access services using SSL v3.0 only; they just won’t understand other SSL encryption protocols than SSL v3.0. For more information, please refer to:
Vulnerability in SSL 3.0 – Poodle attack and Exchange 2010 or Exchange 2013
Therefore, only if the application accessing uses only SSL 3.0 would be affected. Please contact your vendor which provide
a service deemed as critical to confirm if it has TLS enabled by default. Then you can change the POP3 connection to use TLS to have a try.
Regards,
Winnie Liang
TechNet Community Support

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