"I am having the same Error message (550) and using the same format. My number was originally from Verizon."Ditto for me.I found that when I include a subject line on the email message it fails.I found that when I do NOT include a subject line on the email message, with exactly the same body of the email message, it works fine.
Already have an account? Login
Enter your username or e-mail address. We'll send you an e-mail with instructions to reset your password.
Sorry, we're still checking this file's contents to make sure it's safe to download. Please try again in a few minutes.
Sorry, our virus scanner detected that this file isn't safe to download.