Is there an easier way to write and rewrite our e-mail addresses rather than always spelling them out. i.e. to automate writing one's e-mail address?

What email program are you using? Most of them have the capability to do this built into the program.

It is not about sending e-mails, i t is more about (sorry that I asked the wrong  question) something like Google auto-fill but filling in more than e-mail and name and credit card numbers.

There are a great number of programs that will complete forms automatically.
Just enter "autocomplete" in a search engine and you should get links to a lot of their web sites.

also, if you use Opera as a browser, you have not only autocomplete options, but also lots of personal info available on a right click.

   In Outlook Express if you have the email address in your contacts list, you just have to type the first letter or two in the To slot and it will autocomplete it.