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Of many customers I get a signature in the form of an image as attachment.

I only need this attachment once, but now all emails of that customers are marked as "with attachment".

How could I block those attachments? Or blacklist them? But keep all other attachments, that are not in my blacklist?

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I would write or find an Thunderbird add-on to do this. – Ramhound Jun 25 '13 at 15:24
I cannot find any addon that does this. would it be easy to program such? I also asked this in this german thunderbird forum – rubo77 Jun 25 '13 at 22:51

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