To answer your question - Are you having a problem sending to all of your contacts or only those with Verizon email accounts?
I am having a problem sending to various email accounts. Not all of the time just once in awhile. Lately it seems to be happening more often.
Periodically I receive the below message from, after sending email to various people in my address book - WHY?
"MAILER-DAEMON@nm9.bullet.mail.ne1.yahoo.com" MAILER-DAEMON@nm9.bullet.mail.ne1.yahoo.com
Sorry, we were unable to deliver your message to the following address...