I might try this heat transfer method before sending out the image. I wondered also how much smudging might occur through the mail. Thanks, everyone, for your input!

Once you try the heat method, you'll never go back! ;) You definitely have to have a toner based ink. Ink jet won't work. I print out several stamps I want to do all on one page and go to the library to make a copy. I've been told you can save and reuse the copied image if you need to redo the stamp for whatever reason. I haven't tried that.