Best Practice for Avoiding Duplicate Candidate Records

Summary

We are looking for best practices or ways other TBE users are avoiding the creation of duplicate candidate records.

Content

Because TBE's primary key is a candidate's email address, our candidates end up with multiple records. After submitting a ticket we learned this is the intended functionality and we would need to load an enhancement request if wanted to have a new key field added. Other than adding more verbiage to our careers page to help candidates and then merging records once duplicates are created we are looking for best practices or ways other TBE users are avoiding duplicate records. Any and all ideas would be greatly appreciated.