When the value of the MessageRetrievalMimeFormat parameter is set to 1 or HtmlOnly by running the Set-IMAPSettings cmdlet, IMAP clients don't receive HTML messages for plain-text only emails in a Microsoft Exchange Server 2013 or Exchange Server 2016 environment.
This issue occurs because the MessageRetrievalMimeFormat parameter isn't honored during the Mime Convert process for plain-text only email messages.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Id. de artículo: 4024651 - Última revisión: 27-06-2017 - Revisión: 6