SMTPGuard是一个SMTP的防垃圾邮件软件。适用于ISP。-SMTPGuard is an SMTP anti-spam software. Applicable to ISP.

"Email list management and delivery software" that has the ability to send emails to a list of up to 50,000 people at a rate of about 5,000 emails per hour. User should have the option to use their ISP s outgoing mailserver, or send the email "