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what does a red circle with a line through it by a message mean?

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to the left of some messages there is a red circle th a line through it and there is no indication what it means.

Please supply a list of ALL symbols that could appear in the main display and what they mean

to the left of some messages there is a red circle th a line through it and there is no indication what it means. Please supply a list of ALL symbols that could appear in the main display and what they mean

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Found this with a Google search of Thunderbird icons. http://kb.mozillazine.org/Icons_-_Thunderbird_2