Resolving – 550 5.1.8 Access denied, bad outbound sender
You've encountered the error "Remote Server returned '550 5.1.8 Access denied, bad outbound sender AS(42004)" in Exchange Online. This error typically occurs when a sender exceeds outbound limits or sends suspicious emails, such as spam. To resolve this issue, follow these steps: Step 1: Identify the Affected User Log in to your Exchange Online Admin [...]









