效果

要求

1. 一个域名
2. 一个阿里云账号
3. 引入阿里云SDK

下载SDK

进入阿里云找到邮件推送服务

新建一个发信域名和一个发信地址

关键代码

private void btnEmailReset_Click(object sender, EventArgs e)
        {
            Random rd = new Random();
            newpassword = (rd.Next(10000000, 100000000)).ToString();//随机生成一个8位数字密码
            DataSet ds = DBOperate.readDB("select * from UserInfo where UserEmail='" + txtEmailReset.Text.Trim() + "'");
            if (ds.Tables[0].Rows.Count > 0)
            {
                if (DBOperate.writeDB("update UserInfo set UserPassword='" + newpassword + "' where UserEmail='" + txtEmailReset.Text.Trim() + "'") > 0)
                {
                    IClientProfile profile = DefaultProfile.GetProfile("cn-hangzhou", "阿里云", "密钥");
                    IAcsClient client = new DefaultAcsClient(profile);
                    SingleSendMailRequest request = new SingleSendMailRequest();
                    try
                    {
                        String pass = "<table style=\";width:99.8%;height:99.8%\";><tbody><tr><td style=\";background:#fafafa url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAICAYAAADED76LAAAAy0lEQVQY0x2PsQtAYBDFP1keKZfBKIqNycCERUkMKLuSgZnRarIpJX8s3zfcDe9+794du+8bRVHQOI4wDAOmaULTNDDGYFkWMVVVQUTQdZ3iOMZxHCjLElVV0TRNYHVdC7ptW6RpSn3f4wdJkiTs+w6WJAl4DcOAbdugKAq974umaRAEARgXn+cRW3zfFxuiKCJZloXGHMeBbdv4Beq6Duu6Issy7iYB8Jbnucg8zxPLsggnj/zvIxaGIXmeB9d1wSE+nOeZf4HruvABUtou5ypjMF4AAAAASUVORK5CYII=)\";><div style=\";border-radius:10px;font-size:13px;color:#555;width:666px;font-family:'Century Gothic','Trebuchet MS','Hiragino Sans GB','微软雅黑','Microsoft Yahei',Tahoma,Helvetica,Arial,SimSun,sans-serif;margin:50px auto;border:1px solid #eee;max-width:100%;background:#fff repeating-linear-gradient(-45deg,#fff,#fff 1.125rem,transparent 1.125rem,transparent 2.25rem);box-shadow:0 1px 5px rgba(0,0,0,.15)\";><div style=\";width:100%;background:#49BDAD;color:#fff;border-radius:10px 10px 0 0;background-image:-moz-linear-gradient(0deg,#43c6b8,#ffd1f4);background-image:-webkit-linear-gradient(0deg,#43c6b8,#ffd1f4);height:66px\";><p style=\";font-size:15px;word-break:break-all;padding:23px 32px;margin:0;background-color:hsla(0,0%,100%,.4);border-radius:10px 10px 0 0\";>尊敬的图书馆管理系统用户您好：</p></div><div style=\";margin:40px auto;width:90%\";><p>" + newpassword + "是您的新密码，请牢记</p><p>请注意：此邮件自动发送，请勿直接回复。</p></div></div></td></tr></tbody></table>";
                        request.AccountName = "你的发信域名";
                        request.FromAlias = "图书管理系统";
                        request.AddressType = 1;
                        request.TagName = "BackPassword";
                        request.ReplyToAddress = true;
                        request.ToAddress = (txtEmailReset.Text.Trim()).ToString();
                        request.Subject = "图书管理系统的重置后密码";
                        request.HtmlBody = pass;
                        SingleSendMailResponse httpResponse = client.GetAcsResponse(request);
                    }
                    finally
                    {
                        MessageBox.Show("邮件发送成功，如未收到请联系系统管理员或者在垃圾箱中寻找");
                    }
                    this.Close();
                }
                else
                {
                    MessageBox.Show("重置失败，请联系系统管理员!");
                }
            }