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Body font and size <> signature font type and size

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My emails default to a signature that never matches the body of the email's font or size. How do I sync them so that the sig does not look like it has been auto added.

My emails default to a signature that never matches the body of the email's font or size. How do I sync them so that the sig does not look like it has been auto added.

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Generally the issue is the signature is not created in Thunderbird, so contains loads of font and layout information of it's own as a HTML page. WE generally suggest making signatures in the Thunderbird composer. See https://support.mozilla.org/en-US/kb/signatures