I like the domain !<p>Is this a Show HN ?<p>I wonder how many people will actually pay for being able to edit (probably realizing so after they visit again in a few months). They can just as well create a new one ? Only if its very elaborate the editing might be useful ?<p>You could offer a login with LinkedIn or Facebook to pre-fill the fields and maybe offer some preset layout settings. Makes it more dynamic and that way you learn more about your clients.
The lack of control of the formatting is frustrating. For example, it seems very obvious to me to put my name and title on separate lines, as opposed to just concatenating them and having it wrap.<p>Also, having the images uploaded hosted on your AWS account is basically a non-starter. Casual users probably won't notice this, but it's kind of a bad idea to have your email signature logo rely on some service that might disappear tomorrow. Offer an option to pay now to make the whole thing self-contained by converting the image src to a data: url.