Today I entered 109 new email addresses into my (Snow Leopard) Address Book, creating a single group. I also created a new Gmail address, intending to coral all responses to the new address. Apple Mail did not allow me to send this group mail- listing a bunch of email addresses as invalid. When I tested by sending the same message to a single email address out of the invalid ones, the email was sent. And, when I split the group into two groups of 55 and 54 each, I was able to send the entire new sub-groups. My question: is there a limitation in Mail, or Gmail, and/or Roadrunner mail, limiting the number of individual emails listed in a group? Does anyone reading this understand what is going on? I need to be able to email the entire group as a whole, so people can then reply to the entire group, not just the half-group they are in.