Dave - How do I add an HTML signature to my Thunderbird mail account? I installed Thunderbird and now I find that it doesn't have an apparent sig file handler??...

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Mail is set as the default email program on our Mac, so when we happen to click on an email link in anything (say, our browser), the Mail app automatically opens up and creates an email message. We don't want that, we'd like to be able to designate our chosen email apps (I use Thunderbird, she uses Entourage). How do you change this?...

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