CRA still insists on paper. I cannot find a similar resource for the T183, but the 2016 FAQ for the T1013 makes this clear in two ways:
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That you will make sure that the taxpayer has completed and physically signed a Form T1013
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Does the Canada Revenue Agency accept digital and electronic signatures on Form T1013? No. For now, we are not accepting these types of signatures on Form T1013.
http://www.cra-arc.gc.ca/esrvc-srvce/tx/prprrs/t1013-eng.html
Can anyone find a source that would be specific to the T183 form?