Da un esempio di systemnetmail.com:

codice:
	Dim mail As New MailMessage()

	mail.From = New MailAddress("me@mycompany.com")
	mail.[To].Add("you@yourcompany.com")

	mail.Subject = "This is an email"
	mail.Body = "this content is in the body"
	
	mail.Attachments.Add(New Attachment("c:\temp\example.txt"))
	mail.Attachments.Add(New Attachment("c:\temp\example2.txt"))
	mail.Attachments.Add(New Attachment("c:\temp\example3.txt"))

	Dim smtp As New SmtpClient("127.0.0.1")
	smtp.Send(mail)