邮箱

在form表单里的基本代码格式：

<form id="form1" runat="server">
        <div>
            收件人：<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
            标题：<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox><br />
            正文：<asp:TextBox ID="TextBox3" TextMode="MultiLine" runat="server"></asp:TextBox>
            <br />
            <asp:Button ID="Button1" runat="server" Text="发送" />
        </div>
    </form>

点开后台，在后台服务端写：（源码）

protected void Page_Load(object sender, EventArgs e)
    {
        Button1.Click += Button1_Click;
    }

    void Button1_Click(object sender, EventArgs e)
    {
        //需要邮箱服务器
        SmtpClient smtp = new SmtpClient("smtp.qq.com");
        //发件人
        MailAddress from = new MailAddress("849337077@qq.com");
        //收件人
        MailAddress to = new MailAddress(TextBox1.Text);
        //邮件整体
        MailMessage msg = new MailMessage(from, to);
        //邮件标题
        msg.Subject = TextBox2.Text;
        //邮件内容
        msg.Body = TextBox3.Text;

        smtp.UseDefaultCredentials = false;
        smtp.EnableSsl = true;
        NetworkCredential cred = new NetworkCredential("849337077@qq.com", "hmkkdqgyxyhebbhe");
        smtp.Credentials = cred;

        smtp.Send(msg);
    }