mailing to a list of addressees is now impossible.
Here's an idea...termnate all the memberss of the team that developed the "new' yahoo mail. I have groups of addressees that I email frequently. Worked great with old yahoo mail. Now it doesnlt work at all. I can select the list I want to email to but cannot move that list of addressees to the bcc address section. Needs fixing.

Hi there! Thank you for reaching out. Could you please share your email address with us in a Private Message on our Yahoo Customer Care page https://www.facebook.com/YahooCustomerCare/ ? We're looking forward to helping you!
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David Cherrick commented
You should check all functions with an un-involved party before launching. Just put a lap top in front of a person sitting at Starbucks that has a Yahoo mail account and ask them to send an email to a group of their friends. Then Shut Up and watch the person struggle to do it. take notes. go back and fix it. Stop launching un-tested products.