Revert "Bug 808650 - Implement filtering by contact email."

This reverts commit 493b0d71879d033c2c16a6c5044ac34a509e08a5.
Merge pull request #8014 from KevinGrandon/bug_838871_backout_bug_808650

Bug 838871 - Revert "Bug 808650 - Implement filtering by contact email."