the PHP and MySQL requirements are set. I'm not positive about the apache setting though - perhaps some one else knows.
Are you also aware that there's a limit on the number of E-mails you can send out from your website per hour? It may not be very functional for you to install a mass mailing software on your account. Have you considered the DH provided one in the panel?
Also, if you want to keep your account, you should make sure that you're in compliance with DH's anti-spam requirements in the TOS.
art.googlies.net - personal website