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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...
I have the same issue - can send emails through outlook.com in a browser but immediately bounces back when trying to send via the Windows 10 mail app or MS Outlook 2016 which has been happening since this morning.
I've tried to remove my account from outlook account settings and add it back in but to no avail 😞
I'm having the same issue as of this morning. Emails sent from other devices (my iphone, ipad) are working, but anything from my PC using the same email addresses are bounced back as failed sends.