HomeMicrosoft OfficeOutlookMicrosoft 365 Exchange Error Code 5.6.11 – Invalid characters

Microsoft 365 Exchange Error Code 5.6.11 – Invalid characters

In this post, let’s have a look at the error message “5.6.11 – Invalid characters” that you get when working with Microsoft 365 Exchange Online.

These are the errors that you usually receive when there is a problem in delivering the email message that was sent by you. These errors are generated and sent by Office 365. This is usually alled as DSN which stands for delivery status notification or in simple words bounce messages.

NDR or Non-delivery report is one of the common type of message that you receive which indicates to the user that the email was not delivered.

Error Message

5.6.11 – Invalid characters

Error Details

Your email program added invalid characters (bare line feed characters) into a message you sent.

For more information, see Fix email delivery issues for error code 5.6.11 in Exchange Online.

Leave a Reply

You May Also Like

Outlook Web is a powerful tool for managing your email, tasks, and appointments. One of the most useful features of...
Hotmail is one of the most popular free email services in the world. Launched in 1996, it was one of...
In this post, you’ll learn about Logging in Microsoft Outlook and how to enable or disable this feature in the...