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Original snippet by wp-mix.com at http://wp-mix.com/wordpress-404-email-alerts/ With the improved OOP style, implementation is a lot more straightforward, just add <?php new Clean_404_Email; to the top of your 404.php template.

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clean_404_emails.php
PHP
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<?php
// Just require() this class via your theme's functions.php file.
/* Then instantiate this at the top of your 404.php file with:
if ( class_exists( 'Clean_404_Email' ) )
new Clean_404_Email;
*/
 
class Clean_404_Email {
 
var $time, $request, $blog, $email, $theme, $theme_data, $site, $referer, $string, $address, $remote, $agent, $message;
 
function __construct() {
$this->headers();
$this->setup_vars();
$this->setup_email();
$this->send_mail();
}
function headers() {
echo header( "HTTP/1.1 404 Not Found" );
echo header( "Status: 404 Not Found" );
}
function setup_vars() {
$this->blog = get_bloginfo( 'name' );
$this->site = home_url( '/' );
$this->email = get_bloginfo( 'admin_email' );
// theme info
if ( ! empty( $_COOKIE["nkthemeswitch" . COOKIEHASH] ) ) {
$this->theme = $this->clean( $_COOKIE["nkthemeswitch" . COOKIEHASH] );
} else {
$this->theme_data = wp_get_theme();
$this->theme = $this->clean( $this->theme_data->Name );
}
 
// referrer
$this->referer = isset( $_SERVER['HTTP_REFERER'] ) ? $this->clean( $_SERVER['HTTP_REFERER'] ) : 'undefined';
 
// request URI
$this->request = isset( $_SERVER['REQUEST_URI'] ) && isset( $_SERVER['HTTP_HOST'] ) ? $this->clean( 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] ) : 'undefined';
 
// query string
$this->string = isset( $_SERVER['QUERY_STRING'] ) ? $this->clean( $_SERVER['QUERY_STRING'] ) : 'undefined';
 
// IP address
$this->address = isset( $_SERVER['REMOTE_ADDR'] ) ? $this->clean( $_SERVER['REMOTE_ADDR'] ) : 'undefined';
 
// user agent
$this->agent = isset( $_SERVER['HTTP_USER_AGENT'] ) ? $this->clean( $_SERVER['HTTP_USER_AGENT'] ) : 'undefined';
 
// identity
$this->remote = isset( $_SERVER['REMOTE_IDENT'] ) ? $this->clean( $_SERVER['REMOTE_IDENT'] ) : 'undefined';
 
// log time
$this->time = $this->clean( date( "F jS Y, h:ia", time() ) );
}
 
function clean( $string ) {
$string = rtrim( $string );
$string = ltrim( $string );
$string = htmlentities( $string, ENT_QUOTES );
$string = str_replace( "\n", "<br />", $string );
 
if ( get_magic_quotes_gpc() ) {
$string = stripslashes( $string );
}
return $string;
}
 
function setup_email() {
$this->message = '
<html><body>
<table width="70%" border="1" style="border-color: #777;" cellpadding="10">
<colgroup width="25%" style="text-align:right;" />
<colgroup id="colgroup" class="colgroup" width="1*" valign="middle" span="2" align="center" />
<thead>
<tr>
<th scope="col">Element</th>
<th scope="col">Data</th>
</tr>
</thead>
<tfoot>
<tr>
<td>User Agent</td>
<td>' . $this->agent . '</td>
</tr>
</tfoot>
<tbody>
<tr>
<td>Date/Time</td>
<td>' . $this->time . '</td>
</tr>
<tr>
<td>404 URL</td>
<td>' . $this->request . '</td>
</tr>
<tr>
<td>Site</td>
<td>' . $this->site . '</td>
</tr>
<tr>
<td>Theme</td>
<td>' . $this->theme . '</td>
</tr>
<tr>
<td>Referer</td>
<td>' . $this->referer . '</td>
</tr>
<tr>
<td>Query String</td>
<td>' . $this->string . '</td>
</tr>
<tr>
<td>Remote Address</td>
<td>' . $this->address . '</td>
</tr>
<tr>
<td>Remote Identity</td>
<td>' . $this->remote . '</td>
</tr>
</tbody>
</table>
</body></html>';
}
function email_headers() {
return sprintf( 'From: %s' . "\r\n" . 'MIME-Version: 1.0' . "\r\n" . 'Content-Type: text/html; charset=ISO-8859-1' . "\r\n", $this->email );
}
 
function send_mail() {
mail( $this->email, sprintf( '404 Alert: %1$s [ %2$s ]', $this->blog, $this->theme ), $this->message, sprintf( 'From: %s', $this->email_headers() ) );
}
 
} // Clean_404_Email

Added a not-completely-awful HTML table for the email: http://cl.ly/image/0G2Q0N0K3y1k

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