If you prefer to compose your posts in a desktop client, or if you plan to blog from your phone, you'll need to enable either the Atom or the XML-RPC protocol. Your client should let you know which one to use. If you don't plan to post remotely, you should leave these protocols disabled; occasionally, hackers discover vulnerabilities in them. While security updates are always released quickly when this happens, it's no fun to realize that you've left yourself open to attack for the sake of a feature you never use!
Popular desktop clients include MarsEdit and the BlogMate plugin for TextMate on the Mac, and BlogDesk, Windows Live Writer, and Word 2007 for Windows. Desktop clients allow you to write while offline and post when you are connected to the internet. Before autosaving and spell checking were available in the WordPress edit screens, desktop clients were essential for many bloggers.
Posting by e-mail is possible, but somewhat limited. HTML tags will be stripped from e-mail messages. Attachments are not converted to media uploads, but are instead included as raw data. The post will be assigned to the default category specified in this section, if different from the usual default category, unless your e-mail subject begins with [n], where n is the ID of another category.
In addition to filling in the e-mail account details listed on this screen, you'll also need to set up a way for WordPress to check that mailbox periodically. You can use cron, the WP-Cron plugin, Procmail, or .qmail. Check http://codex.wordpress.org/Post_to_your_blog_using_email for detailed instructions.
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