Forum Discussion
SPAM, Identity Impersonation
When a domain hosted by O365 (https://t.co/oxjPSMab3X) send SPAM and Phishing to other domains hosted on the platform, how to prevent this?
Is it *your* domain? If so, you should investigate which users are sending those messages and take any necessary actions. If you are simply receiving spam messages from that domain, report them (https://technet.microsoft.com/en-us/library/jj723151(v=exchg.150).aspx) and optionally add that domain to the block list to prevent future spams.