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Hey,

What's the maximum size for an envelope that doesn't need a large letter stamp?
I use second class stamps and my envelope sizes are 254x178mm / 10x7 inches

Thanks in advance,
Qwerty

Small letter sizes (for first and second class) are...

Length: 240mm max
Width: 165mm max
Thickness: 5mm max

So for your size, you'll need large letter stamps.

Bummer.

Thanks