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I sent a request through her website http://www.sarahmclachlan.com/ on Jan 4th 2014 and received this in the mail on Jan 28 2014, not sure if its authentic


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Hi Beatlesnut09

Thank you for your feedback Great Success

You have been added to the list for the $10 gift certificate.

Sarah McLachlan on Fanmail.biz | Previous Feedback(s) Received

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That's definitely her authentic signature, although I cant tell if it's a pre print by your photo.
If it's not a PP print you should see ink coming through the back when held up to a light source.
I love Sarah nice success either way.