There are many ways to publish an article on a WordPress blog, for example you can use desktop clients like Windows Live Writer on Windows or KBlogger on Linux or directly post article through admin panel (dashboard) of WordPress setup.
Configuration:

1. Go to the WordPress Dashboard.
2. Under Settings ==> Writing option,
3. You can see a section as Post via e-mail. Enter an email ID (dedicated to posting articles only),
4. Server settings like port number and Mail Server which you can get through your web server ( in case using an email ID hosted on your server) or you can get the details for Gmail or Yahoo accounts
5. From the settings page of those email IDs. Enter the password of that email account.
6. Now select the default category from the “Default Mail Category” drop  down.
7. Click on “Save Changes” to save the setting. Done.
8. Now you can send an email to the email ID specified on the settings ==> writing page. Subject of the Email will be treated as the “Title” of the post and the body part of the email will be the content. As this way you can only post text articles on your blog so write only texts in the mail. Attachments will not be considered for the post content.
9. After sending the email for a new post, you need to run the following link on browser. http://example.com/wpinstalldir/wp-mail.php
10. This URL will update your site / blog and the new post will be reflected on that. The new post will be published by the name of “Site Admin”.