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Can not send Group E mail from Thunderbird.Single E mail works.OK on 1 computer ,but not on other.

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Sending E mail to group using my address book does not work.OK on 1 computer but not on other.Works on individual E mail OK.

Sending E mail to group using my address book does not work.OK on 1 computer but not on other.Works on individual E mail OK.

Chosen solution

Cleared the start up cache and re entered the data,which solved the problem.My error was trying to backup E -mail group and reinstall.Lesson learned.Was able to do in the past. You can back up,but is a real chore.

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and do you get any sort of error message that might offer a clue as to what is happening?

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Not really.Often turns Red.Will try deleting and reinstall.imported files from another computer,which works. Thanks for the reply.

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Chosen Solution

Cleared the start up cache and re entered the data,which solved the problem.My error was trying to backup E -mail group and reinstall.Lesson learned.Was able to do in the past. You can back up,but is a real chore.