The plan was simple. Create a new email account in Outlook that would connect to mail.legacyfarmltd.com to send the message with SMTP. The first couple of tests worked like a charm. Then I sent a reply to a person on earthlink.net and got the:

“550 Relaying Denied. Not A Local Domain: earthlink.net. If you are a customer, download messages via POP, and try again.”

Further research at Interland was not encouraging. I tried a couple of things but finally gave up and sent it via Yahoo.