如何将MailMessage对象另存为* .eml或* .msg文件

Question 1

如何将MailMessage对象保存到磁盘？MailMessage对象不公开任何Save（）方法。

如果它以任何格式保存，*。eml或* .msg，我都没有问题。任何想法如何做到这一点？

Question 2

为了简单起见，我只引用Connect项目的说明：

您实际上可以将SmtpClient配置为将电子邮件发送到文件系统而不是网络。您可以使用以下代码以编程方式执行此操作：
SmtpClient client = new SmtpClient("mysmtphost");
client.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory;
client.PickupDirectoryLocation = @"C:\somedirectory";
client.Send(message);
您还可以像这样在应用程序配置文件中进行设置：

 <configuration>
     <system.net>
         <mailSettings>
             <smtp deliveryMethod="SpecifiedPickupDirectory">
                 <specifiedPickupDirectory pickupDirectoryLocation="C:\somedirectory" />
             </smtp>
         </mailSettings>
     </system.net>
 </configuration>

发送电子邮件后，您应该会看到电子邮件文件已添加到您指定的目录中。然后，您可以让一个单独的过程以批处理方式发送电子邮件。

您应该能够使用空的构造函数而不是列出的构造函数，因为它无论如何都不会发送它。

Question 3

这是将MailMessage转换为包含EML数据的流的扩展方法。它使用文件系统时显然有点hack，但是它可以工作。

public static void SaveMailMessage(this MailMessage msg, string filePath)
{
    using (var fs = new FileStream(filePath, FileMode.Create))
    {
        msg.ToEMLStream(fs);
    }
}

/// <summary>
/// Converts a MailMessage to an EML file stream.
/// </summary>
/// <param name="msg"></param>
/// <returns></returns>
public static void ToEMLStream(this MailMessage msg, Stream str)
{
    using (var client = new SmtpClient())
    {
        var id = Guid.NewGuid();

        var tempFolder = Path.Combine(Path.GetTempPath(), Assembly.GetExecutingAssembly().GetName().Name);

        tempFolder = Path.Combine(tempFolder, "MailMessageToEMLTemp");

        // create a temp folder to hold just this .eml file so that we can find it easily.
        tempFolder = Path.Combine(tempFolder, id.ToString());

        if (!Directory.Exists(tempFolder))
        {
            Directory.CreateDirectory(tempFolder);
        }

        client.UseDefaultCredentials = true;
        client.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory;
        client.PickupDirectoryLocation = tempFolder;
        client.Send(msg);

        // tempFolder should contain 1 eml file

        var filePath = Directory.GetFiles(tempFolder).Single();

        // stream out the contents
        using (var fs = new FileStream(filePath, FileMode.Open))
        {
            fs.CopyTo(str);
        }

        if (Directory.Exists(tempFolder))
        {
            Directory.Delete(tempFolder, true);
        }
    }
}

然后，您可以获取返回的流并根据需要进行处理，包括保存到磁盘上的另一个位置或存储在数据库字段中，甚至通过电子邮件发送附件。

Question 4

如果您使用的是Mailkit。只需写下面的代码

string fileName = "your filename full path";
MimeKit.MimeMessage message = CreateMyMessage ();
message.WriteTo(fileName);

Question 5

由于一个或另一个原因，client.send失败（在使用该方法实际发送之后），因此我插入了良好的ole CDO和ADODB流。在设置.Message值之前，我还必须使用template.eml加载CDO.message。但这有效。

由于上面的是C，这里是VB的一个

    MyMessage.From = New Net.Mail.MailAddress(mEmailAddress)
    MyMessage.To.Add(mToAddress)
    MyMessage.Subject = mSubject
    MyMessage.Body = mBody

    Smtp.Host = "------"
    Smtp.Port = "2525"
    Smtp.Credentials = New NetworkCredential(------)

    Smtp.Send(MyMessage)        ' Actual Send

    Dim oldCDO As CDO.Message
    oldCDO = MyLoadEmlFromFile("template.eml")  ' just put from, to, subject blank. leave first line blank
    oldCDO.To = mToAddress
    oldCDO.From = mEmailAddress
    oldCDO.Subject = mSubject
    oldCDO.TextBody = mBody
    oldCDO.HTMLBody = mBody
    oldCDO.GetStream.Flush()
    oldCDO.GetStream.SaveToFile(yourPath)

Question 6

试试这个

请使用这两个参考（使用MailBee;）（使用MailBee.Mime;）

    public static string load(string to,string from,string cc,string bcc,string subject,string body, List<string> reportList,string path, bool HtmlbodyType)
    {
        try
        {
            MailBee.Mime.MailMessage msg = new MailBee.Mime.MailMessage();
            msg.From.AsString = from;
            msg.Subject = subject;
            if (HtmlbodyType == true)
            {
                msg.BodyHtmlText = body;
            }
            else
            {
                msg.BodyPlainText = body;
            }
            
            string[] receptionEmail = to.Split(new string[] { ",", ";" }, StringSplitOptions.RemoveEmptyEntries);
            string[] ccEmail = cc.Split(new string[] { ",", ";" }, StringSplitOptions.RemoveEmptyEntries);
            string[] bccEmail = bcc.Split(new string[] { ",", ";" }, StringSplitOptions.RemoveEmptyEntries);
            string message = "";
            foreach (string To in receptionEmail)
            {
                msg.To.Add(To);
            }
            foreach (string CC in ccEmail)
            {
                    msg.Cc.Add(CC);
            }
            foreach (string Bcc in bccEmail)
            {
                    msg.Bcc.Add(Bcc);

            }
                for (int x = 0; x < reportList.Count; x++)
                {
                    string fileName = reportList[x];
                    msg.Attachments.Add(fileName);
                }

                msg.SaveMessage(path);
                return "Success";
            
        }
        catch (Exception ex)
        {
            return ex.Message;
        }

    }