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这个是在开发自动发报表程序中使用到的，下面的内容有几段，来自不同的地方，有网上的，也有日本人提供给我的样式（其实是敷衍）

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首先添加引用

Imports System.Net.Mail

Dim client As New System.Net.Mail.SmtpClient()
client.Host = "smtp.163.com"
client.UseDefaultCredentials = False
client.Credentials = New System.Net.NetworkCredential("自已的163邮件地址","密码")
client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network
Dim message As New System.Net.Mail.MailMessage("自已的163邮件地址","收件人邮件地址")
message.Subject = "主题测试"
message.Body = "asp.net发送邮件"
message.BodyEncoding = System.Text.Encoding.UTF8
message.IsBodyHtml = True
'添加附件需将(附件先上传到服务器)
Dim data As New System.Net.Mail.Attachment("Upload/File1.rar",System.Net.Mime.MediaTypeNames.Application.Octet)
message.Attachments.Add(data)
Try
client.Send(message)
Response.Write("Email successfully send.")
Catch ex As Exception
Response.Write("Send Email Failed." + ex.ToString())
End Try

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'送信者
Dim senderMail As String = "邮件地址"
'宛先
Dim recipientMail As String = "邮件地址"
'件名
Dim subject As String = "業務連絡"
'本文
Dim body As String = "おはようございます"

Dim sc As New System.Net.Mail.SmtpClient()
'SMTPサーバーを指定する
sc.Host = "192.168.0.3"
Dim mms As New System.Net.Mail.MailMessage

'メールを送信する
Try
sc.Send(senderMail,recipientMail,subject,body)
Catch ex As Exception
MsgBox(ex.Message,MsgBoxStyle.Critical)
End Try

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创建发件连接,根据你的发送邮箱的SMTP设置填充
Dim smtp As New System.Net.Mail.SmtpClient("smtp.163.com",25)

'发件邮箱身份验证,参数分别为 发件邮箱登录名和密码
smtp.Credentials = New System.Net.NetworkCredential("用户名","密码")

'创建邮件
Dim mail As New System.Net.Mail.MailMessage()

'邮件主题
mail.Subject = "邮件主题"

'主题编码
mail.SubjectEncoding = System.Text.Encoding.GetEncoding("GB2312")

'邮件正文件编码
mail.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312")

'发件人邮箱
mail.From = New System.Net.Mail.MailAddress("example@163.com")

'邮件优先级
mail.Priority = System.Net.Mail.MailPriority.Normal

'HTML格式的邮件,为false则发送纯文本邮箱
mail.IsBodyHtml = True

'邮件内容
mail.Body = "邮件正文内容"

'添加收件人,如果有多个,可以多次添加
mail.To.Add("收件人地址")

'定义附件,参数为附件文件名,包含路径,推荐使用绝对路径
'如果不需要附件,下面三行可以不要
Dim a As New System.Net.Mail.Attachment("附件文件")

'附件文件名,用于收件人收到附件时显示的名称
a.Name = "附件文件名"

'加入附件,可以多次添加
mail.Attachments.Add(a)

'发送邮件
Try

smtp.Send(mail)
MessageBox.Show("发送成功")

Catch

MessageBox.Show("发送失败")

Finally

mail.Dispose() End Try