2022年6月13日 星期一

[研究][C#][ASP.NET] 加簽寄信(使用 MailKit 和 MimeKit)(四)多收件者與多附件

[研究][C#][ASP.NET] 加簽寄信(使用 MailKit 和 MimeKit)(四)多收件者與多附件

2022-06-13

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相關數篇

[研究][C#][ASP.NET] 加簽寄信(使用 MailKit 和 MimeKit)(四)多收件者與多附件
https://shaurong.blogspot.com/2022/06/caspnet-mailkit-mimekit_13.html

[研究][C#][ASP.NET] 加簽寄信(使用 MailKit 和 MimeKit)(三)多收件者與單一附件
https://shaurong.blogspot.com/2022/06/caspnet-mailkit-mimekit_12.html

[研究][ASP.NET]加簽寄信-Windows Server 2019 IIS 10.0 抓 Key Store 中Email憑證所需的權限設定

[研究][C#][ASP.NET] 加簽寄信(使用 MailKit 和 MimeKit)(二)單一收件者、副本、密件
https://shaurong.blogspot.com/2022/06/caspnet-mailkit-mimekit.html

[研究][C#][ASP.NET] 加簽寄信 (使用 MailKit 和 MimeKit)
https://shaurong.blogspot.com/2019/10/caspnet-mailkit-mimekit_13.html

[研究][C#][ASP.NET] 寄信 (使用 MailKit 和 MimeKit)
https://shaurong.blogspot.com/2019/10/caspnet-mailkit-mimekit_11.html

[研究][C#][ASP.NET] 加簽寄信 (使用 System.Net.Mail.MailMessage)
https://shaurong.blogspot.com/2019/10/caspnet-systemnetmailmailmessage.html
更新補充一些資訊,更新到 2021-11-29

[研究][ASP.NET]單一或多個 Email 格式驗證 (使用C#)

[研究]單一或多個 Email 格式驗證 (使用 HTML5)

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環境:Visual Studio 2022 + ASP.NET + WebForm + Web Application + C#

先設定權限

[研究][ASP.NET]加簽寄信-Windows Server 2019 IIS 10.0 抓 Key Store 中Email憑證所需的權限設定https://shaurong.blogspot.com/2022/06/aspnet-windows-server-2019-iis-100-key.html

NuGet 要安裝 MailKit  ( System.Data.SQLite 則不用),會自動安裝

Portable.BouncyCastle.1.9.0
System.Buffers.4.5.1
System.Numerics.Vectors.4.5.0
System.Runtime.CompilerServices.Unsafe.4.5.3
System.Memory.4.5.4
System.Text.Encoding.CodePages.4.5.1
MimeKit.3.2.0
System.Threading.Tasks.Extensions.4.5.4
MailKit.3.2.0

Web.Config 部分

<?xml version="1.0" encoding="utf-8"?>
<configuration>
	<appSettings>
		<add key="EmailCertificateSN" value="郵件憑證序號" />
	</appSettings>
</configuration>

CommonMailKit.cs

using MailKit.Net.Smtp;
using MailKit.Security;
using MimeKit;
using MimeKit.Cryptography;
using MimeKit.Utils;
using System;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using System.Web;
using System.Web.UI.WebControls;

namespace WebApplication1
{
    public static class CommonMailKit
    {
        #region == SendCertMailAttachListbyMailKit ==
        public static string SendCertMailAttachListbyMailKit(
            string emailSubject,
            string emailContent,
            string toAddressList,
            string ccAddressList,
            string bccAddressList,
            FileUpload emailAttachList)
        {

            // http://www.mimekit.net/docs/html/Creating-Messages.htm
            var message = new MimeMessage();
            message.From.Add(new MailboxAddress("User123", "User123@abcdef.com.tw"));
char[] stringSeparators = new char[] { ',', ';' }; if (toAddressList != null) { toAddressList.Replace(" ", "");//移除半形空白 InternetAddressList toList = new InternetAddressList(); foreach (var item in toAddressList.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)) { // Invalid local-part at offset 0 // https://github.com/jstedfast/MailKit/issues/494 // toList.Add(new MailboxAddress(item, item)); var address = MailboxAddress.Parse(item); //address.Name = name; toList.Add(address); } message.To.AddRange(toList); } else { return "寄信失敗,收件者Email沒有設定。"; } // Cc 可以沒有 if (!string.IsNullOrEmpty(ccAddressList)) { ccAddressList.Replace(" ", "");//移除半形空白 InternetAddressList ccList = new InternetAddressList(); foreach (var item in ccAddressList.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)) { var address = MailboxAddress.Parse(item); //address.Name = name; ccList.Add(address); } message.Cc.AddRange(ccList); } // Bcc 可以沒有 if (!string.IsNullOrEmpty(bccAddressList)) { bccAddressList.Replace(" ", "");//移除半形空白 InternetAddressList bccList = new InternetAddressList(); foreach (var item in bccAddressList.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)) { var address = MailboxAddress.Parse(item); //address.Name = name; bccList.Add(address); } message.Bcc.AddRange(bccList); } // 預設回信收件者 message.ReplyTo.Add(new MailboxAddress("預設回信收件者", "User456@abcdef.com.tw"));
//message.Subject = "Digitally Signing Email Test"; message.Subject = emailSubject; // message.Body = new MimeKit.TextPart("plain") // { // Text = @"Hey Alice, //What are you up to this weekend? Monica is throwing one of her parties on //Saturday and I was hoping you could make it. //Will you be my +1? //-- Joey //" // }; // http://www.mimekit.net/docs/html/Creating-Messages.htm var builder = new BodyBuilder(); // Set the plain-text version of the message text builder.TextBody = @"Hey Alice, What are you up to this weekend? Monica is throwing one of her parties on Saturday and I was hoping you could make it. Will you be my +1? -- Joey "; // In order to reference selfie.jpg from the html text, we'll need to add it // to builder.LinkedResources and then use its Content-Id value in the img src. //var image = builder.LinkedResources.Add(@"C:\Users\Joey\Documents\Selfies\selfie.jpg"); //image.ContentId = MimeUtils.GenerateMessageId(); // Set the html version of the message text // builder.HtmlBody = string.Format(@"<p>Hey Alice,<br> //<p>What are you up to this weekend? Monica is throwing one of her parties on //Saturday and I was hoping you could make it.<br> //<p>Will you be my +1?<br> //<p>-- Joey<br> //<center><img src=""cid:{0}""></center>", image.ContentId); builder.TextBody = "EmailBody"; // We may also want to attach a calendar event for Monica's party... // 下面測試可用 //builder.Attachments.Add(@"C:\Users\Administrator\Desktop\a.png"); HttpFileCollection httpFileCollection = HttpContext.Current.Request.Files; for (int i = 0; i < httpFileCollection.Count; i++) { HttpPostedFile httpPostedFile = httpFileCollection[i]; try { if (httpPostedFile.ContentLength > 0) { string filePath = httpPostedFile.FileName; string filename = Path.GetFileName(filePath); Stream fs = httpPostedFile.InputStream; BinaryReader br = new BinaryReader(fs); Byte[] bytes = br.ReadBytes((Int32)fs.Length); MemoryStream destination = new MemoryStream(bytes); builder.Attachments.Add(filename, destination); } } catch (Exception ex) { if (ex == null) { return "不明錯誤。"; } else return ex.Message; } } // Now we just need to set the message body and we're done message.Body = builder.ToMessageBody(); //message.Body = new TextPart("plain") //{ // Text = emailContent //}; // http://www.mimekit.net/docs/html/Working-With-SMime.htm // Note: by registering our custom context it becomes the default S/MIME context // instantiated by MimeKit when methods such as Encrypt(), Decrypt(), Sign(), and // Verify() are used without an explicit context. //CryptographyContext.Register(typeof(MySecureMimeContext)); X509Store store = new X509Store("My", StoreLocation.LocalMachine); store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly); //如果新舊憑證都尚未過期,會抓到舊的憑證 //X509Certificate2 signCert = store.Certificates.Find(X509FindType.FindBySubjectName, "憑證名稱", false)[0]; //從Web.Config中抓Email憑證序號值 string emailCertificateSN = ConfigurationManager.AppSettings["EmailCertificateSN"]; if (emailCertificateSN == null || emailCertificateSN == "") { return "讀取不到Email憑證序號。"; } //用 Email憑證序號抓比較不會抓錯 X509Certificate2 signCert = store.Certificates.Find(X509FindType.FindBySerialNumber, emailCertificateSN, false)[0]; //用指紋抓 // X509Certificate2 signCert = store.Certificates.Find(X509FindType.FindByThumbprint, "12339f33449f0cc767feb69e6dc2774ce10c1f60", false)[0]; // VS 2019 中正常,deploy 後執行,出現錯誤「機碼組不存在」 // 要用 MMC 設定 Email 憑證可讓 IIS_IUSRS 存取 CmsRecipient recipient = new CmsRecipient(signCert); CmsRecipientCollection colle = new CmsRecipientCollection(); colle.Add(recipient); using (var ctx = new MimeKit.Cryptography.TemporarySecureMimeContext()) { // Note: this assumes that the Sender address has an S/MIME signing certificate // and private key with an X.509 Subject Email identifier that matches the // sender's email address. var ctxsender = message.From.Mailboxes.FirstOrDefault(); CmsSigner signer = new CmsSigner(signCert); message.Body = MultipartSigned.Create(ctx, signer, message.Body); // MimeKit.Cryptography.CertificateNotFoundException // A valid signing certificate could not be found. //message.Body = MultipartSigned.Create(ctx, ctxsender, DigestAlgorithm.Sha1, message.Body); } // http://www.mimekit.net/docs/html/M_MailKit_Net_Smtp_SmtpClient__ctor.htm using (var client = new SmtpClient()) { // IIS SMTP 要設定 None,Auto 會失敗 //client.Connect("localhost", 25, SecureSocketOptions.None); //http://www.mimekit.net/docs/html/T_MailKit_Security_SecureSocketOptions.htm //client.Connect("smtp.abcdef.com.tw", 25, false);// 非 SSL連線 client.Connect("smtp.abcdef.com.tw", 25, SecureSocketOptions.Auto);// Auto SSL連線 //client.Connect("smtp.abcdef.com.tw", 465, SecureSocketOptions.Auto); //client.Connect("smtp.abcdef.com.tw", 587, SecureSocketOptions.Auto); // 某些 Mail Server (SMTP) 寄信惠要求帳號、密碼 // 某些 Mail Server (SMTP) 的帳號是完整含 @ 的Email,有些是 @ 之前的 client.Authenticate("郵件寄信帳號", "郵件寄信密碼"); //client.Authenticate("zzzz@gmail.com", "郵件寄信密碼"); try { //foreach (var message in messages) //{ client.Send(message); //} client.Disconnect(true); return ""; //成功 } catch (Exception ex) { if (ex != null) { return ex.Message.ToString(); } else { return "不明錯誤。"; } } } } #endregion } }


Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" 
    CodeBehind="Default.aspx.cs" Inherits="WebApplication1.Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        Signed Email Test<br />
        <asp:FileUpload ID="FileUpload1" runat="server" AllowMultiple="true" /><br />
        <asp:Button ID="Button_SendMail" runat="server" 
            Text="Send" OnClick="Button_SendMail_Click" /><br />
        <asp:Label ID="Label1" runat="server"></asp:Label>
    </form>
</body>
</html>

Default.aspx.cs

using System;

namespace WebApplication1
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        protected void Button_SendMail_Click(object sender, EventArgs e)
        {
            Label1.Text = "";
            string sendMailResult = CommonMailKit.SendCertMailAttachListbyMailKit
                ("主旨-附件測試", "內容",
                "user123@abcdef.com.tw","","", FileUpload1);
            if (sendMailResult == "")
            {
                Label1.ForeColor = System.Drawing.Color.Green;
                Label1.Text = DateTime.Now.ToString()+ "成功。";
            }
            else
            {
                Label1.ForeColor = System.Drawing.Color.Red;
                Label1.Text = DateTime.Now.ToString() + sendMailResult;
            }
            //----------
            string sendMailResult2 = CommonMailKit.SendCertMailAttachListbyMailKit
                ("主旨-附件測試", "內容",
                ""user123@abcdef.com.tw", "", "", null);
if (sendMailResult2 == "") { Label1.ForeColor = System.Drawing.Color.Green; Label1.Text = DateTime.Now.ToString() + "成功。"; } else { Label1.ForeColor = System.Drawing.Color.Red; Label1.Text = DateTime.Now.ToString() + sendMailResult2; } } } }

實際測試

(完)

相關

[研究][ASP.NET]加簽寄信-值不能為 null。參數名稱: findValue

mimekit - 在MimeKit上,簽名和加密
http://hant.ask.helplib.com/mimekit/post_4274560

MailKit Documentation - Creating messages
http://www.mimekit.net/docs/html/Creating-Messages.htm
有簡單寄信範例 (但沒有加簽)

MailKit Documentation - Digitally Signing Messages using S/MIME
http://www.mimekit.net/docs/html/Working-With-SMime.htm#Sign

.NET Framework 中過時的類型
https://docs.microsoft.com/zh-tw/dotnet/framework/whats-new/obsolete-types
System.Web.Mail.SmtpMail 過時,建議的替代做法是 System.Net.Mail.SmtpClient。

System.Net.Mail.SmtpClient
https://docs.microsoft.com/zh-tw/dotnet/api/system.net.mail.smtpclient?view=netframework-4.8
System.Net.Mail.SmtpClient 淘汰,建議改用 https://github.com/jstedfast/MailKit 和 https://github.com/jstedfast/MimeKit

GitHub - jstedfast/MailKit: A cross-platform .NET library for IMAP, POP3, and SMTP.
https://github.com/jstedfast/MailKit

GitHub - jstedfast/MimeKit: A .NET MIME creation and parser library with support for S/MIME, PGP, DKIM, TNEF and Unix mbox spools.
https://github.com/jstedfast/MimeKit

[研究][C#][ASP.NET] 加簽寄信 (使用 System.Net.Mail.MailMessage)
https://shaurong.blogspot.com/2019/10/caspnet-systemnetmailmailmessage.html

[研究][C#]加密加簽寄信(使用Cpi.Net.SecureMail)(一)
http://shaurong.blogspot.com/2017/02/ccpinetsecuremail.html

[研究][C#]加密加簽寄信(使用Cpi.Net.SecureMail)(二)
http://shaurong.blogspot.com/2017/02/ccpinetsecuremail_13.html

[研究][C#][ASP.NET] IIS SMTP 寄信失敗,拒絕存取路徑
https://shaurong.blogspot.com/2019/10/caspnet-iis-smtp.html

[研究] [ASP.NET] [C#] [WebForm] 寄信問題
http://shaurong.blogspot.com/2017/06/aspnet-c-webform.html

An S/MIME Library for Sending Signed and Encrypted E-mail
Pete Everett, 15 Jul 2010
https://www.codeproject.com/Articles/41727/An-S-MIME-Library-for-Sending-Signed-and-Encrypted

ASP.NET寄發加密加簽信件
https://www.nccst.nat.gov.tw/ArticlesDetail?lang=zh&seq=1160

Cpi.Net.SecureMail
https://www.codeproject.com/script/Content/ViewAssociatedFile.aspx?rzp=%2FKB%2Fsecurity%2FCPI_NET_SecureMail%2F%2FCpi.Net.SecureMail_src.zip&zep=Cpi.Net.SecureMail_src%2FCpi.Net.SecureMail%2FSecureMailMessage.cs&obid=41727&obtid=2&ovid=5

如何透過 .NET 送出一個包含 S/MIME 簽章的郵件
2009/06/06 21:20
https://blog.miniasp.com/post/2009/06/06/How-to-send-s-mime-email-using-net

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