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How to address clasp envelopes
Consider an adhesive label.
If the clasp on your envelope makes it difficult to write legibly, think about purchasing a sticky address label from a post office or stationary store. You can write on the label on a flat surface, then peel it off and fix it onto the envelope.

Options are: -- Adhesive labels are available at post office or stationary stores. These labels allow the envelope's adhesive to help hold it together while it's sealed.; -- Write the label on the back, then put it back on the envelope. Glue the letter around the mailhouse.; -- This will make writing legible to the recipient. You can also design your own address label.; -- If you decide to write directly on the envelope, just continue to the next step. The return address label should be smaller than the main address label.;
If you decide to write directly on the envelope, just continue to the next step. The return address label should be smaller than the main address label.