Outlook

Microsoft 365 Exchange Error Code 5.7.501 – Access denied, spam abuse detected

Microsoft 365 Exchange Error Code 5.7.134 – Sender was not authenticated for mailbox

Microsoft 365 Exchange Error Code 5.7.133 – Sender not authenticated for group

Microsoft 365 Exchange Error Code 5.7.509 – Access denied, sending domain [$SenderDomain] does not pass DMARC verification

Microsoft 365 Exchange Error Code 5.1.10 – Recipient not found

Microsoft Outlook Email Error Code – 550 SC-002

Microsoft Outlook Email Error Code – 421 RP-001

How to Turn On or Off Microsoft Outlook Logging?

Microsoft 365 Exchange Error Code 5.1.90 – Your message can’t be sent because you’ve reached your daily limit for message recipients

Microsoft 365 Exchange Error Code 4.7.321 – starttls-not-supported: Destination mail server must support TLS to receive mail.

Microsoft 365 Exchange Error Code Generating server – This field indicates the name of the SMTP mail server that created the NDR.

Microsoft 365 Exchange Error Code 5.7.124 – Sender not in allowed-senders list

Coding on a computer screen

Microsoft 365 Exchange Error Code 5.7.703 – Your message can’t be delivered because one or more recipients are blocked by your organization’s tenant recipient block policy

Microsoft 365 Exchange Error Code 5.7.136 – Sender was not authenticated

Microsoft 365 Exchange Error Code 5.4.6 or 5.4.14 – Routing loop detected

Microsoft 365 Exchange Error Code 5.7.503 – Access denied, banned sender

Microsoft Outlook Email Error Code – 550 OU-001

Microsoft Outlook Email Error Code – 550 SC-003

Microsoft 365 Exchange Error Code 5.7.606-649 – Access denied, banned sending IP [IP1.IP2.IP3.IP4]

Microsoft 365 Exchange Error Code 5.7.750 – Service unavailable. Client blocked from sending from unregistered domains