MBP retina15". Yosemite. I'm trying to send a small email, containing nothing more than 2 YouTube links. I've tried a number of email addresses incl. my own, and every time I get this in a message window: " cannot send message. A copy has been placed in your outbox. The recipient xxxxx.com was rejected as the server does not allow relaying." Anything I can do? Cheers.