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I'm using Thunderbird 10.0.2 on Mac and have a simple text signature.

When I write new message, Thunderbird automatically adds -- before the signature, but when I click on reply to a message, it doesn’t.

How can I get it to always add the -- before my signature?

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FWIW, Setting it up for appending after quote of original message appears to retain the '-- ' separator. You can configure it in:

Account-Settings -> Your Account -> Composition and Addressing -> and place my signature set to below the quote.

This setting is appropriate for bottom posting.

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Yes, there has to be a space after the -- for it to work. Most Usenet clients acknowledge it as well, and so strip out the signature on replies. – paradroid Feb 25 '12 at 23:11

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