The newest version (0.3) of my Comment E-Mail Verification plugin now supports SMTP as an alternative method to send mail.

Download it directly from the wordpress.org plugin directory

Thanks to Mark for testing and feedback

It is also the first version to come with a German translation.

If you would like to help by translating this plugin to another language please download the plugin, grab the .pot file, create .po and .mo files and e-mail them to me. (You will be credited.) If this was all gibberish to you you can still help: please start by reading Translating WordPress Plugins & Themes – Of course you may contact me at anytime to find out whether anyone else has announced or sent to me a translation to that language already. This will avoid any unnecessary efforts on your side.