设置属性

message.Priority = System.Net.Mail.MailPriority.High \'邮件的优先级,有三个值:高(在邮件主题前有一个红色感叹号,表示紧急),低(在邮件主题前有一个蓝色向下箭头,表示缓慢),正常(无显示)

https://msdn.microsoft.com/zh-cn/library/ms223213.aspx

Dim client As New System.Net.Mail.SmtpClient()
client.Host = "smtp.qq.com"
client.Credentials = New System.Net.NetworkCredential("lin_hailun@qq.com", "helen6849338.")
client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network
Dim message As New System.Net.Mail.MailMessage("lin_hailun@qq.com", "765427475@qq.com")
message.Subject = "邮件测试"
message.BodyEncoding = System.Text.Encoding.UTF8
message.Priority = System.Net.Mail.MailPriority.High \'邮件的优先级,有三个值:高(在邮件主题前有一个红色感叹号,表示紧急),低(在邮件主题前有一个蓝色向下箭头,表示缓慢),正常(无显示)

\'message.Bcc.Add("2450314695@qq.com") \'密送

\'message.cc.Add("2450314695@qq.com") \'抄送

Dim content As String

content &= "这是文字" & vbcrlf
content &= "也是文字"

message.Body = content

Try
    client.Send(message)
    msgbox("发送成功")
Catch ex As Exception
    msgbox("发送失败:" & ex.message)

finally

    message.Dispose()
End Try