In Exchange Online, you can control TNEF (also known as the Transport Neutral Encapsulation Format, Outlook Rich Text Format, or Exchange Rich Text Format) settings in remote domains, and in the properties of mail contacts or mail users. If the attachment is too big, the line length of the header field is too long, so the receiving email server will reject the message. In Rich Text formatted messages, the attachment's binary large object (BLOB) becomes part of the header stream in the X-MS-TNEF-Correlator header field. How do I fix this? x-dg-ref header is too long Otherwise, forward the NDR to your admin for help. If the NDR contains Requested action not taken: policy violation detected (AS345), remove some embedded files from the attachment. For more information, see Change the message format to HTML, Rich Text Format, or plain text. If the NDR contains x-dg-ref header is too long, use HTML formatting for messages in Outlook instead of Rich Text Format. This issue occurs if the message contains an attachment (for example, a Word file) with 20 or more embedded files (for example, Excel or Word files). Or, if the NDR also contains Requested action not taken: policy violation detected (AS345), that's another specific problem with a specific solution.
The message likely contains at least one attachment, and one of the attachments is likely an email message that also contains at least one attached email message. This issue occurs if you use Rich Text formatting in Outlook messages. How do I fix it?ĥ.0.350 is a generic wrapper that's used by Exchange Online for a wide variety of non-specific errors that are typically returned by the recipient's email organization.īut, if the NDR also contains x-dg-ref header is too long, that's a specific problem with a specific solution. Use the information in the NDR to help you decide how to fix the problem. This topic describes what you can do if you see error code 550 5.0.350 in a non-delivery report (also known as an NDR, bounce message, delivery status notification, or DSN). It's frustrating when you get an error after sending an email message.
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