How to associate multiple email addresses to unique requester login

How to associate multiple email addresses to unique requester login

Hi,
Many requesters have several mail accounts, but I'd like to associate them to unique requester account, ad unique requester login.
I've tried unifing requester ID or filling secondary mail field, but still  a mail from a@mail.com goes to user a
and a2@mail.com gous to user a2 if exist or create a new user account, if not.







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