@Shokhet OP mentioned he receives many mail of various size and as per his method he has to shake each envelope and cut the border with scissors. When a recipient's address has a suite number, things can get a bit more complicated. Envelopes larger than letter-size will be charged package prices. However this method is time consuming. According to an old CIA manual, the tool should have a smooth edge, preferably with a curved, blunt tip. Blindly writing on an envelope without prior knowledge is only going to cause you problems. Verify, add, or edit the information in the Addressee and Sender boxes (the “from" on the envelope). Do the violins imitate equal temperament when accompanying the piano? side of the envelope, it is an open side envelope. Questions such as ‘where to write an address on envelopes’ or ‘how to format your return address’ are important questions to ask. Then, hold the envelope against a flat surface and carefully rock the tool back and forth to loosen the flap. From the effort, the classic look of the envelope, the handwriting, the feeling that’s been put in the letter, the excitement of opening the envelope, to the process of reading the letter itself – there’s a one-of-a-kind sense of feeling one can accomplish. There are 10 references cited in this article, which can be found at the bottom of the page. Put all your envelopes in a microwave for 10-15 secs and slight flip on the flap of the sealed envelope is enough. Good advice. What can I do to find the end of the tape roll easily? 3. "Using steam and a dry blunt hot metal knife worked really well together to get it open. I have two very useful methods that I use. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/2\/26\/Open-a-Sealed-Envelope-Step-1-Version-4.jpg\/v4-460px-Open-a-Sealed-Envelope-Step-1-Version-4.jpg","bigUrl":"\/images\/thumb\/2\/26\/Open-a-Sealed-Envelope-Step-1-Version-4.jpg\/aid36026-v4-728px-Open-a-Sealed-Envelope-Step-1-Version-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"