Yahoo recently changed its authentication policy, and the change could impact delivery of emails that come from yahoo.com addresses. That means if you send an email broadcast and your From Address is a personal address at yahoo.com, there’s an increased chance your emails will go to spam or bounce.  

The new policy requires any email sent using a Yahoo account to originate from that account.  This affects scanners, phone messaging systems and email broadcasts that can potentially use any email address as the 'Send From' address.

More information about Yahoo's new policy can be found here.