Mass, Bulk mailing. Built-in SMTP Engine. Multi threaded. Direct mail delivery. 300 mails at a time. HTML & text. Unlimited attachments. Auto Image embedding. Personalized mailing. Auto subscribe & unsubscribing. Import & Export of profile. Checks the validity of email instantly. Filters. Outlook Address book compatible. Database compatibility. Priority setting. Life long up gradation. Only 260 kb. Just download and run. No installation.