truetone

I took a look into the source code and Contact Form 7 just wraps the email up and then sends it to WordPress’ wp_mail() function.

if ( $attachments ) {
		$for_this_mail = array();
		foreach ( $attachments as $name => $path ) {
			if ( false === strpos( $mail_template['attachments'], "[${name}]" ) )
				continue;
			$for_this_mail[] = $path;
		}
		return @wp_mail( $mail_recipient, $mail_subject, $mail_body, $mail_headers, $for_this_mail );
	} else {
		return @wp_mail( $mail_recipient, $mail_subject, $mail_body, $mail_headers );
	}

Perhaps the issue lies there. Unfortunately that function is poorly documented at the moment.

This happened to me after moving my WP install to a new server. The solution that finally worked was to:

1. rename the uploads folder
2. create a new uploads folder
3. change the permissions on the new folder to 777 (755 might work as well, I haven’t tried that)
4. move my folders from the old uploads folder to the new one
5. Upload a file via WordPress

I should note that my new file I uploaded for the final step was the first one for the current month. The newly uploaded image was able to create a new folder in ‘uploads’ (in my case uploads/2008/11) and save the image there. This after months of toying around with permissions.

Of further note: I am not running PHP in Safe Mode.