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Microsoft 365 Exchange Error Code – This value is returned by the mail server that rejected the original message.

Microsoft 365 Exchange Error Code – This value is the name of the mail server that rejected the message.

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 More info for email admins – This section provides a detailed explanation of the problem and solution along with technical details and a link to a web-based article that has detailed reference information.

Microsoft 365 Exchange Error Code Fix-it owner indicator – This section provides an at-a-glance view of the issue and who needs to fix it.

Microsoft 365 Exchange Error Code Office 365 logo – This indicates that Microsoft 365 or Office 365 generated the NDR. The logo doesn’t mean that Microsoft 365 or Office 365 was responsible for the error.

Microsoft 365 Exchange Error Code n/a – The message can’t be submitted because the sender’s submission quota was exceeded

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

Microsoft 365 Exchange Error Code 5.7.705 5.7.708 – 5.7.705 Access denied, tenant has exceeded threshold, 5.7.708 Access denied, traffic not accepted from this IP

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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 5.7.606-649 – Access denied, banned sending IP [IP1.IP2.IP3.IP4]

Microsoft 365 Exchange Error Code 5.7.513 – Service unavailable, Client host [$ConnectingIP] blocked by $recipientDomain using Customer Block list (AS16012607)

Microsoft 365 Exchange Error Code 5.7.512 – Access denied, message must be RFC 5322 section 3.6.2 compliant

Microsoft 365 Exchange Error Code 5.7.511 – Access denied, banned sender

Microsoft 365 Exchange Error Code 5.7.510 – Access denied, [contoso.com] does not accept email over IPv6

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

Microsoft 365 Exchange Error Code 5.7.508 – Access denied, [$SenderIPAddress] has exceeded permitted limits within $range range