I'm finally getting around to writing thank you notes that I ordered from Etsy months ago. I opened the package and the envelopes are tiny. They are 3.5 x 5 to be exact. I know if an envelope is irregular size or too large it requires special postage. Does anyone know if that applies to small envelopes too? I don't want to waste my time and money on these if they need special postage.
Thank you!