Error-message: Body type not supported by Remote Host
Mozilla Thunderbird: I have suddenly (since about 6 weeks ago) a problem with some emailadresses. In the past i can used the adresses normally. With the rest of my emailadresses i have no problem. In the PNG-attachment you can see two adresses with the problems. I recieve the emails back with the message: “Body type not supported bij Remote Host. And the emails are not posted in the box of the destination. When i used the same emailadresses in the webmail of my provider KPN there is no problem and all works good”. What can be the problem. I work with windows 10.
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بخشها
Open the config editor and toggle the pref "mail.strictly_mime" from false to true.
At the top right of the Thunderbird window, click the menu button 
> Options > Advanced > General > Config Editor.