We have installed JMail on our Windows shared servers. You can use following sample script to send emails via JMail.
Set JMail = Server.CreateObject("JMail.SMTPMail")
JMail.ServerAddress = "SMTP_SERVER"
JMail.Sender = "mail@YOURDOMAIN"
JMail.Subject = "Email Subject"
JMail.Body = "Email contents"
JMail.Priority = 1
We don't offer pre-installed JMail with default VPS configuration. However, VPS users can purchase JMail license and install it.
Note: It is recommended to use email list cleaning service before sending out an email campaign