I am adding members to my group. Yahoo refuses theese addresses: [e-mail] [e-mail]. Why?

Question

I know for sure that this is valid addresses. I want them in my group. What can I do?

Answer 1

many of those will show up as invalid due to spammers that have often used them, ruined it for anyone who may have a valid account.

Answer 2

you'll will have to send them a link to the group and let them join there..