Undeliverable E-Mail - Microsoft Community

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every time try send email response back.

"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."

hi ericlongworth,

if office 365 account , cannot send emails out, please contact admin check if account in action center. this, please go exchange admin center (eac) admin's credential: protection > action center.

if account in action center list, please refer link release account.

if issue persists after releasing account or account not in list, please sent complete non-delivery report (ndr) analysis in private message. , provide information below analyze:

  1. if outgoing emails cannot delivered or outgoing emails recipients outside of organization?
  2. is there other occurs issue in organization?

please contact if have update.

thanks,

iry



Office / Outlook / Windows other / Office 365 for business



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