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I don't see anything in my blog. Where is the iframe?

The iframe used to call the wp-mail.php file is hidden. Its width and height have been set to 0. If you want to check that the plugin has loaded correctly:

1. Right click in your browser window.
2. Click View Source from the pop-up menu.
3. Scroll to the bottom of the page and look for a line that looks something like this:

<iframe src="http://www.myblog.com/myblog/wp-mail.php" name="mailiframe" width="0" height="0" frameborder="0" scrolling="no" title="">

I activated the plugin, and I still don't see anything. Are you sure this works?

Yes, I'm sure it works :)

If you're using caching on your site, such as WP Super Cache, then you may have to clear the cache before you can see the code.

How do I set up posting via email?

You can read more about Blogging by Email at http://codex.wordpress.org/Blog_by_Email on the WordPress Documentation site.