If you are looking for envelopes for your formal letters from your academic institute, this Envelope Mockup here would be perfect for you. It’s ideally meant for formal postcards and comes with a dimension of 9.75 by 4.3 inches. The white outlook of the envelope creates a classy feel that goes well with the professional message of your post cards.
You are also getting a template for post card here which offers you space to include the slogan of your institution at the left, with the logo at the top. The right side of the postcard template has got lines to note your recipient’s name & address.