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Block feature is not working

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The block feature is not working. I can delete meeages in junk but cannot block them. It was working yesterday. Hope you can help

The block feature is not working. I can delete meeages in junk but cannot block them. It was working yesterday. Hope you can help

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On my top menu bar. Some of the options are: Delete, Block

Delete works, block does not

I have not altered any settings since it last worked

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On my top menu bar. Some of the options are: Delete, Block

Delete works, block does not

I have not altered any settings since it last worked

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Is this problem on a webmail website you are using in Firefox -- so Delete and Block are features of the web page -- or is this problem in Mozilla Thunderbird, the stand-alone email program?