How to filter HTML encoded messages in Thunderbird?

Question

I am using Thunderbird E-mail client v. 2.0.0.23

I would like to filter all HTML encoded messages. For this I created a message filter with a customized header "Content-Type" but that does not work as expected (no messages are filtered).

The filter looks like that:

"Content-Type" "contains" "text/html"

I did not find any related bug or workaround (no add-ons).

Is my filter wrong? Should I try Thunderbird V. 3 beta?

Answer 1

For filters on the body of a message to work on an IMAP account, said account needs to be set up for offline use.

In order to do so go to:

Account settings > Offline & diskspace

and tick "Make the messages in my inbox available when I am working offline"

Then select the ad hoc folders after clicking on "Select folders for offline use ..."

After that my filter will work.

Answer 2

Any emails you receive in HTML format will contain the Content-type: text/html specification in the actual body of the message.

So change your filter to the following:

Body     contains     Content-type: text/html

This will now allow you to filter the emails sent in HTML.