Solution
Please Install the Updated Packages.
Insight
Mozilla Thunderbird is a standalone mail and newsgroup client.
It was found that a Certificate Authority (CA) issued a fraudulent HTTPS certificate. This update renders any HTTPS certificates signed by that CA as untrusted, except for a select few. The now untrusted certificates that were issued before July 1, 2011 can be manually re-enabled and used again at your own risk in Thunderbird
however, affected certificates
issued after this date cannot be re-enabled or used. (BZ#734316)
All Thunderbird users should upgrade to this updated package, which resolves this issue. All running instances of Thunderbird must be restarted for the update to take effect.
Affected
thunderbird on Red Hat Enterprise Linux AS version 4, Red Hat Enterprise Linux ES version 4,
Red Hat Enterprise Linux WS version 4
References
Updated on 2015-03-25
