By default, Firefox Thunderbird will forward email as attachments with the .eml extension. This hasn't been a problem for me until today when the recipient's email server blocked by email due to the attachment. There is a way to switch to inline forwarding, however, Thunderbird has made it a bit difficult for average users. Here's how to turn the default and switch to inline forwarding:

In Thunderbird select:

Tools >Options >Advanced > General > Config Editor

The "Config Editor" will be a button on the right side bottom under the "General" sub-tab of "Advanced". 

The Config Editor looks like this:

Type "forward" into the input box until you get an option that looks like this:

Double click on the row and change the value from "0" to "2"

And that's it. Your emails will now forward as inline and not attachments in Thunderbird.

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