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In order to properly mitigate the POODLE vulnerability the ssl_protocols setting should be set to disable SSLv3, but Dovecot 2.0 (which is included in RHEL6) does not have this setting. There is a patch in the wild which will disable SSLv3 permanently, but a much more elegant resolution would be to backport the ssl_protocols setting from dovecot 2.1. I was able to dig up the exact change from the dovecot mercurial which added ssl_protocols, and I don't think it would be much effort to backport it to 2.0 so that RHEL6 users can continue to use the vendor-supplied dovecot and mitigate this vulnerability in it.
The mercurial patch is:
http://hg.dovecot.org/dovecot-2.1/rev/406a1d52390b