Really...? You would purchase a mailing system???
What you are requesting seems like a pretty simple thing to do via PHP with a typical LAMP server. I have a e-payment notification system that sends out thousands of emails weekly - it's fast and the whole thing was free.
$name = $db_row['name'];
$email = $db_row['email'];
// Build the header...
$header = "From: newsletter@yourdomain.com\r\n";
$header .= "Content-type: text/html; charset=iso-8859-1\r\n";
$subject = "News From My Domain!!!";
// Build the message...
$message = "<p> </p>".
"<style type='text/css'>\n".
"table { border-collapse: collapse; }\n".
"td { text-align: right; vertical-align: top; border: solid 1px #000000; }</style>\n".
"<p><strong><u>Section Header</p>\n".
"<p>Dear $name,</p>\n".
"<p>Info...</p>\n".
"<p> </p>".
"<p><em>Questions? Email: <a href='mailto: whoever@mydomain.com'>Me</a></em></p>";
// Send the email...
mail($email, $subject, $message, $header);
If you want a good tutorial on building a lamp server, try howtoforge.