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Microsoft365 Cannot Send Email | 550 5.1.8 Access Denied

Microsoft365 Cannot Send Email | 550 5.1.8 Access Denied

To see the policy that triggered this:

  • - go here: https://protection.office.com/antispam
  • -click Anti-spam outbound policy (Default).
  • -click EDIT-PROTECTION.
  • -change to NO-ACTION, ALERT-ONLY (note that this is NOT RECOMMENDED).
  • -or keep the default of RESTRICT-THE-USER-FROM-SENDING-MAIL-UNTIL-THE-FOLLOWING-DAY

To see the emails that went out in the last 24 hours:

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