How do you unseal an envelope?

To unseal an envelope, gently slide a thin blade, such as a letter opener or a small knife, between the flaps where they are glued together. Carefully work the blade along the seam to loosen the adhesive without tearing the paper. If you prefer a less invasive method, you can also use steam from a kettle or a hot cup of water—hold the envelope above the steam for a few seconds to soften the glue, then gently pull the flaps apart. Always take care to preserve the contents inside and avoid damage to the envelope itself.