Dovecot 2.0.X which ships with CentOS 6 does not have a flag to disable SSLv3 [ which is now broken by POODLE ]. Attached below are recompiled versions with SSLv3 disabled along with the SRC RPM.

dovecot-2.0.9-8.el6.x86_64.rpm
dovecot-devel-2.0.9-8.el6.x86_64.rpm
dovecot-mysql-2.0.9-8.el6.x86_64.rpm
dovecot-pgsql-2.0.9-8.el6.x86_64.rpm
dovecot-pigeonhole-2.0.9-8.el6.x86_64.rpm
dovecot-2.0.9-8.el6.src.rpm