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The signature can be customized under "Settings" → "Identities" → "Your Identity" in the "Signature" field.
Additional options for the signature can be found under "Settings" → "Composing Message" → "Signature Options"
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The signature can be customized under "Settings" → "Identities" → "Your Identity" in the "Signature" field.
Additional options for the signature can be found under "Settings" → "Composing Message" → "Signature Options"
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