主题：SmtpErrorInvalidRecipientsEvent 能帮助不？

 Dim client As New System.Net.Mail.SmtpClient()
client.Host = "mail.dawnrays.com"
client.Credentials = New System.Net.NetworkCredential("xxxxxx")
client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network
Dim message As New System.Net.Mail.MailMessage
message.From = New System.Net.Mail.MailAddress("xxxxx")
message.Subject = "xxxxx"
message.BodyEncoding = System.Text.Encoding.UTF8
message.IsBodyHtml = True


message.Body = body