Dark Mailer - Dark Mailer is a newsletter and opt-in mailer, which sends out personalized emails to your customers or users that have requested info. Dark Mailer can be plugged into your existing customer database to mail out weekly or monthly newsletters automatically. Dark Mailer allows you to send plain text or HTML Newsletters and is also built with Tag Macros so you can personalize your email text. Dark Mailer is very simple to master with online help.