I have colleagues when Outlook receives the letter，Ran for a while after clicking on，Appeared afterwards “This message was not processed，Because the message contains a lot of MIME text” Messages，The source code of the letter follows，As shown below：
Research online，Not many people have encountered this problem，There is no solution，But there is a netizenMention，He has the letter in question 3,000 Attachments，So I check from Server，Sure enough 660 .Png attached file，But there is no content after clicking on the image file。
The source code mentions that the other party’s software is Foxmail，I guess there might be something wrong with the other party’s mailing process (Or forward too many times)，Causes an abnormal format，Finally, Server misinterpreted part of the content into an attachment in image format，That led to such a large number of attachments，And when the number of attachments exceeds a certain amount，Outlook seems to pop out "This message has not been processed，Because the message contains a lot of MIME text。'Message。
Since it has been determined that the mail itself has some problems，So the follow-up method is to ask the other party to open a brand new email，Post content to new mail，Send it out again，See if we can eliminate the problem。
[Reference]
- This message was not processed because it contains a large number of – Microsoft Community
