Spamming Issues with Office 365 - Microsoft Community

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greetings!

i believe email hacked. saw in inbox bunch of undeliverable messages. deleted them cant send emails. got following email. 

"your message couldn't delivered because weren't recognized valid sender. common reason email address suspected of sending spam , it's no longer allowed send messages outside of organization. contact email admin assistance"

any suggestions?

hi elizabeth,

outlook.com email account? if log outlook on web, there dialogs or notifications?

if have not yet changed password, , enable 2-factor authentication. prevent happening again.


Office / Outlook / Other/unknown / Office 365 Home



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