Forum Discussion
Your message wasn't delivered because the recipient's email provider rejected it
Dear all, Recently, I registered 1 account Office 365 trial to experience O365 E3 version before bought it, I create a sharepoint site, upload some document and share with somebody, both the same...
That's the default message you get when the sender's IP is blocked. Which should not happen if the sender is O365, but oh well :) Open a support case and report it, nothing else you can do.
