Send a letter? A4? How exactly?

Hello, do I have to write the sender and recipient in the window? Or can I just write the back, where there's no window—> sender top left, recipient bottom right?

see image

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wilees
2 years ago

Glue a note over the window and label it….. or follow the back of the envelope.

wilees
2 years ago
Reply to  Suat101

Right.