When I send an email to 30 members of a list from yahoo webmail, the messages to my (and others') TPG addresses bounce:
Welcome to TPG Community!
Thanks for raising this issue with us and we'd like to look into it further.
We tried to locate your account using your community details to no avail.
Please send me a PM with your TPG username or customer ID number along with the lists of TPG email addresses that you won't able to send an email.