We have all received them, right? eCards for birthdays, anniversaries or simply as thank you notes. American Greetings, Yahoo and Blue Mountain are some of the big names but there are a large variety of sites that allow one to send personalized greeting cards via email. Typically the recipient clicks on a link in their email and they are taken to the web site where the eCard resides. They are able to view the eCard and then send one in reply if they like.