Adding more than one email address from the same contact to same Gmail e-mail group?

I'm trying to set up a mailing list in Gmail. One contact that I have (say "John") has more than one e-mail address (say John@home.com and John@school.com) that he wants my mail delivered to. Is there a way that I can add both addresses to the mailing list without creating a separate contacts in Gmail?

Adding more than one email address from the same contact to same Gmail e-mail group?
Unfortunately you can only add both addresses if you create two separate contact entries for them. And don't forget that there is a daily sending limit on Gmail: 500.