3

I press Ctrl+U in the Icedove (Thunderbird), and see plaintext. Last two headers are:

Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: base64

and the rest data is encoded.

How to conveniently view HTML source of such email in Icedove without manually copying and decoding the base64?

2

If you search on the Thunderbird Addon page for "base64", you'll find an addon called "Mnenhy" which offers base64-decoding on right-click.

Open The Thunderbird Menu and click on "Add-ons" Search for "mnenhy" and install the addon Restart the browser Right-click on base64-encoded text and click on "Base64" which is as sub-entry of "Decoders"

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