Canada Post Letter Mail Slot

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Canada Post's standard lettermail requirements are between 2 g and 50 g, minimum dimensions of 140 x 90 x 0.18 mm, and maximum dimensions of 245 x 156 x 5 mm. This slot helps with determining whether your mail qualifies as standard lettermail. It's 5 mm high by 156 mm wide, so if you can fit it through (and it's less than 245 mm long), then you can rest assured that your mail is not oversize. It also includes a printed reminder of the weight requirements, and notches at 90 mm and 140 mm so you can verify that your letter is not undersize either.