Gmail 以回复方式发送电子邮件

通过gmail发送emai lmail非常简单，如下所示：

通过 Gmail 在 .NET 中发送电子邮件

但是我似乎找不到一种方法来发送电子邮件作为对另一封电子邮件的回复。自动包含以前的消息。

有趣的代码：与发送电子邮件无关(阅读此处，使用 AE。用于 imap 客户端的 Net.Mail 库(

 public GmailConnector()
    {
        StringBuilder sb1 = new StringBuilder();
        using (var context = new SupportDataContext())
        using (var client = new ImapClient("imap.gmail.com", "xxxx@gmail.com", "xxx", AuthMethods.Login, 993, true))
        {
            client.SelectMailbox("INBOX");
            Console.WriteLine(client.GetMessageCount());
            var mm = client.SearchMessages(SearchCondition.Seen(), false, true);
            foreach (var m in mm)
            {
                if (m.Value == null)
                    continue;
                var msg = m.Value;
                var emailRef = msg.To.First().Address;
                SupportThread supportThread = null;
                if (emailRef.Contains("+"))
                {
                    var supportThreadRef = emailRef.Substring(emailRef.IndexOf('+') + 1, emailRef.IndexOf('@') - emailRef.IndexOf('+') - 1);
                    var supportThreadId = long.Parse(supportThreadRef);
                    supportThread = context.SupportThreads.First(x => x.Id == supportThreadId);
                }
                else if (msg.Subject.Contains("RE:"))
                {
                    var subjectRef = msg.Subject.Replace("RE:", "").Trim();
                    var tmpDate = msg.Date.AddDays(-7);
                    var tmpSupportThread = context.SupportThreads.FirstOrDefault(x => x.EntryDate < msg.Date && x.EntryDate > tmpDate && x.Title.Equals(subjectRef));
                    if (tmpSupportThread != null)
                        supportThread = tmpSupportThread;
                }
                if (supportThread == null)
                {
                    supportThread = new SupportThread();
                    supportThread.Title = msg.Subject;
                    supportThread.Creator = msg.From.Address;
                    supportThread.CreatorName = msg.From.DisplayName;
                    supportThread.EntryDate = msg.Date;
                }
                var responseMessage = msg.AlternateViews.GetHtmlView().Body;
                responseMessage.Substring(0, responseMessage.IndexOf(REPLY_SEPERATOR)); 
                var tmpEmailMessage = new EmailMessage();
                tmpEmailMessage.EntryDate = msg.Date;
                tmpEmailMessage.InnerContent = responseMessage;
                tmpEmailMessage.SenderEmail = msg.From.Address;
                tmpEmailMessage.SenderDisplayName = msg.From.DisplayName;
                tmpEmailMessage.Title = msg.Subject;
                tmpEmailMessage.SupportThread = supportThread;
                foreach (var attachment in m.Value.Attachments)
                {
                    var tmpAttachment = new Attachment();
                    tmpAttachment.Data = attachment.GetData();
                    tmpAttachment.Name = attachment.Filename;
                    tmpAttachment.EmailMessage = tmpEmailMessage;
                    context.Attachments.InsertOnSubmit(tmpAttachment);
                }
                context.EmailMessages.InsertOnSubmit(tmpEmailMessage);
                context.SubmitChanges(); 
            }
        }
        var fromAddress = new MailAddress("from@gmail.com", "From Name");
        var toAddress = new MailAddress("to@example.com", "To Name");
        const string fromPassword = "fromPassword";
        const string subject = "Subject";
        const string body = "Body";
        var smtp = new SmtpClient
        {
            Host = "smtp.gmail.com",
            Port = 587,
            EnableSsl = true,
            DeliveryMethod = SmtpDeliveryMethod.Network,
            UseDefaultCredentials = false,
            Credentials = new NetworkCredential(fromAddress.Address, fromPassword)
        };
        using (var message = new System.Net.Mail.MailMessage(fromAddress, toAddress)
        {
            Subject = subject,
            Body = body,
        })
        {
            smtp.Send(message);
        }
        Console.Read();
    }

public static MimeMessage Reply (MimeMessage message, bool replyToAll)
{
    var reply = new MimeMessage ();
    // reply to the sender of the message
    if (message.ReplyTo.Count > 0) {
        reply.To.AddRange (message.ReplyTo);
    } else if (message.From.Count > 0) {
        reply.To.AddRange (message.From);
    } else if (message.Sender != null) {
        reply.To.Add (message.Sender);
    }
    if (replyToAll) {
        // include all of the other original recipients - TODO: remove ourselves from these lists
        reply.To.AddRange (message.To);
        reply.Cc.AddRange (message.Cc);
    }
    // set the reply subject
    if (!message.Subject.StartsWith ("Re:", StringComparison.OrdinalIgnoreCase))
        reply.Subject = "Re: " + message.Subject;
    else
        reply.Subject = message.Subject;
    // construct the In-Reply-To and References headers
    if (!string.IsNullOrEmpty (message.MessageId)) {
        reply.InReplyTo = message.MessageId;
        foreach (var id in message.References)
            reply.References.Add (id);
        reply.References.Add (message.MessageId);
    }
    // quote the original message text
    using (var quoted = new StringWriter ()) {
        var sender = message.Sender ?? message.From.Mailboxes.FirstOrDefault ();
        quoted.WriteLine ("On {0}, {1} wrote:", message.Date.ToString ("f"), !string.IsNullOrEmpty (sender.Name) ? sender.Name : sender.Address);
        using (var reader = new StringReader (message.TextBody)) {
            string line;
            while ((line = reader.ReadLine ()) != null) {
                quoted.Write ("> ");
                quoted.WriteLine (line);
            }
        }
        reply.Body = new TextPart ("plain") {
            Text = quoted.ToString ()
        };
    }
    return reply;
}