Setting Up Post via E-mail- Step 1
1) Log in to WordPress with the administration login you use to administer your WordPress blog.
2) Go to Options > Writing.
3) Read the instructions under Post via e-mail at the bottom of the page. At the end of these instructions, WordPress will suggest three random strings of numbers you may want to use for the login name of the new e-mail account you’ll create.
4) Create a new e-mail account on your web host’s mail server or a separate e-mail server, using one of the suggested numeric strings (or your own secret word) for the username. Do not use public, free e-mail servers like Yahoo, Hotmail, etc., for this account.