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How can I block utf in subject line (I NEVER receive non-spam utf in header)

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I receive spam email daily with subjects starting =?utf-8. Just setting a filter to look for those characters doesn't work. Every time I this question somewhere the answers all seem to say that I shouldn't try to block them, because they might be legitimate. I don't care! I want to block anything that isn't plain text in the header. Help!

I receive spam email daily with subjects starting =?utf-8. Just setting a filter to look for those characters doesn't work. Every time I this question somewhere the answers all seem to say that I shouldn't try to block them, because they might be legitimate. I don't care! I want to block anything that isn't plain text in the header. Help!

Chosen solution

That has nothing to do with whether or not the email plain text or not. That the text encoding. Most online documents will use UTF-8 encoding.

As for your question, perhaps you are asking in the wrong place. Firefox is an internet browser. It has nothing to do with sorting your emails. It simply loads whatever your webmail provider tells it to.

Are you using the Thunderbird email client?

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Chosen Solution

That has nothing to do with whether or not the email plain text or not. That the text encoding. Most online documents will use UTF-8 encoding.

As for your question, perhaps you are asking in the wrong place. Firefox is an internet browser. It has nothing to do with sorting your emails. It simply loads whatever your webmail provider tells it to.

Are you using the Thunderbird email client?