Set-MailboxMessageConfiguration -Identity user -SignatureText $null -DefaultFontSize 7 Also notice that DefaultFontSize is set to 11, when the acceptable range is 1-7. Notice in this example the SignatureHTML is full of the Base64 code. Upon doing so, you get a large listing of their Outlook configuration (shown in the attached TXT doc at the bottom of this post).
You have to do a Get-MailboxMessageConfiguration -Identity user. Looking at the user’s information in the EAC or AdsiEdit reveals no usable information. OWA gives the best error message in the picture below:
The picture is stored as a base64 string that translated to a character length larger than the limit of 8000 characters in an Exchange 2013 signature. User had pasted a large picture into their signature which was acceptable in O365, however it was outside the limits for Exchange 2013.Īlso, one of the property settings was outside the acceptable range, causing the second error. User cannot modify or delete their email signature in Outlook or Outlook Web Access even if you clear the error. I recently encountered these errors with the following setup:Īffected User: A tenant in O365 and was migrated back on-premise to an Exchange 2013 server.Ĭlient: Outlook Web Access and Outlook 2010/2013 The Issue The maximum length is 8000 and the length of the value provided is 16814.”
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