How can I use more than one email address at the same time for one lead?

How can I use more than one email address at the same time for one lead?

Hi

Many of my leads have more than one email address. I´d like to send a newsletter out to all leads, using more than one address if the lead provided me with more than one. This doesn´t seem possible and I´ve been informed that I need to duplicate the leads, each with one email address. Does anyone know a way around this? It seems strange to have to duplicate leads, just to be able to send an email out to both of their addresses. Surely most people use more than one email address nowadays?

Thanks,
Jitske