checking e-mail

checking e-mail

Hello,

Can somebody maybe help me.
We are using crm but we we give some leads in or import them, there is a check on the e-mailadres (the main one), not the second.
Otherwise there is no check if the mailadres is already in use with a client (or the contactpersons of the client).

Is there a possibility to link this en to make this check possible.

Thanks

Jan