Question: how to send mail to all yahoo members? 

Answer: 1. You cannot possibly find a list of all Yahoo addresses unless you use some automated tool to create addresses (eg., a@yahoo.com, aa@yahoo.com etc)\n2. You should NOT do that because this is SPAM and just not done !\n3. If you do this it will give you loads of Bad Karma !!!
This question from the Yahoo Q&A forum is categorized in the topic: Health