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How do I block specific email addresses?

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I am receiving spam that is offensive and unwanted. I want to block the sender's address.

I am receiving spam that is offensive and unwanted. I want to block the sender's address.

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Firefox doesn't do email, it's strictly a web browser.

If you are using Firefox to access your mail, you are using "web-mail". You need to seek support from your service provider or a forum for that service.

If your problem is with Mozilla Thunderbird, let us know and we can move this thread to the Thunderbird queue. This question currently is in the Firefox queue for answers.