wordpress@website.com

You say you’re emailing to wordpress@mywebsite.com, but your error message shows wordpress@website.co.uk

In any case, email addresses are created on the server, not through WordPress.

So, to be clear, you’ve gone into the admin user’s settings and specified an email address for example: theadminguy@example.com

But WordPress is sending out emails to wordpress@example.com instead of using theadminguy@example.com

Sound right?

Okay, I understand. It’s actually expected behavior — just went back and checked on some of my emails and they also come from wordpress@tddewey.com.

I suppose there’s probably a way to hook into and change the email address, but I don’t see a particular reason to need to do so. To what purpose are you trying to email your blog back? Perhaps we can find a way around it.

Gotcha. Looks like there’s a filter already set-up for you called wp_mail_from.

So, we can add a filter hook and modify the wp_mail_from if it’s from wordpress@whatever as well as the wp_mail_from_name to be “noreply” or similar.

This can be put in your theme’s functions.php — it was tested with WordPress 3.0b1 — it should work on 2.9…

function changedefaultemail($from_email) {
	$sitename = strtolower( $_SERVER['SERVER_NAME'] );
		if ( substr( $sitename, 0, 4 ) == 'www.' ) {
			$sitename = substr( $sitename, 4 );
		}

	if (strtolower($from_email) == 'wordpress@'.$sitename) {
		$from_email = 'noreply@'.$sitename;
		return $from_email;
	}
}

function changedefaultname ($wp_mail_from_name) {
	if (strtolower($wp_mail_from_name) == 'wordpress') {
		$wp_mail_from_name = 'noreply';
		return $wp_mail_from_name;
	 }
}

add_filter ( 'wp_mail_from', 'changedefaultemail' );
add_filter ( 'wp_mail_from_name','changedefaultname');