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Is there a way to have Thunderbird prefer the text/plain attachment to a text/html attachment when both are available in a message?

Here's my problem:

I want to view the output of my cron jobs as plain text. I have Thunderbird configured to use a monospace font for plain text emails. However, somebody (I suspect my Exchange server) is adding a text/html attachment to the message. When Thunderbird sees that it renders the text/html attachment in a proportional font. I'd like Thunderbird to only see the text/plain attachment and render it using monospaced font.

Any ideas?

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Go to the file menu:

View > Message Body As > Plain Text

This will default all incoming emails to display the plain-text version.

To change this back:

View > Message Body As > Original HTML

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Another good option is to select Simple HTML. This often provides clearer view than Original HTML, yet without the oversimplification of Plain Text – Alexander Shcheblikin Sep 4 '14 at 11:35

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