The SSL protocol allows client-server applications to communicate across a network in a way designed to prevent eavesdropping and tampering.
Version 1.0 was never publicly released because of serious security
flaws in the protocol; version 2.0, released in February 1995,
"contained a number of security flaws which ultimately led to the design
of SSL version 3.0"
As of 2014 the 3.0 version of SSL is considered insecure as it is vulnerable to the POODLE attack that affects all block ciphers in SSL
If you have linux server, using secure socket layer, you really should disable SSLv3 now
for the security of your users. By doing this, clients will no longer be
able to use the insecure SSLv3 protocol to connect to you, and will
have to use a newer, more secure alternative like TLS.
With this gig I will help you disabling SSLv3 on your server. If the server is in internet available I will check it against ssllabs and help you get A rating.
Under the same conditions I can disable SSLv3 in Postfix and Dovecot. Just contact me for custom offer.