使用 MailKit (C#) 转发电子邮件

Forward email using MailKit (C#)(使用 MailKit (C#) 转发电子邮件)

问题描述

我正在尝试使用 MailKit 访问 IMAP 帐户(由 jstedfast 创建)

I'm trying to access to an IMAP account using MailKit (created by jstedfast)

我设法下载了消息(作为 MimeMessage)，但有时我需要将其转发"到另一个帐户.

I manage to download the message (as a MimeMessage), and at some point I need to "forward" it to another account.

最好的方法是如何做到这一点，以保留原始电子邮件的所有信息(地址、标题、正文内容等).

How would be the best way to do it, in order to preserve all the information of the original email (adresses, headers, body content, etc).

谢谢！

推荐答案

不同的人说前进"的意思不同，所以我想我会针对我能想到的不同含义提供答案.

Different people mean different things when they say "forward", so I guess I'll provide answers to the different meanings that I can think of.

p>

1.转发(重新发送)消息而不做任何更改.

var message = FetchMessageFromImapServer ();

using (var client = new SmtpClient ()) {
    client.Connect ("smtp.example.com", 465, true);
    client.Authenticate ("username", "password");

    var sender = new MailboxAddress ("My Name", "username@example.com");
    var recipients = new [] { new MailboxAddress ("John Smith", "john@smith.com") };

    // This version of the Send() method uses the supplied sender and
    // recipients rather than getting them from the message's headers.
    client.Send (message, sender, recipients);

    client.Disconnect (true);
}

<强>2.以自动过滤器可能发送的方式转发(重新发送)消息.

var message = FetchMessageFromImapServer ();

// clear the Resent-* headers in case this message has already been Resent...
message.ResentSender = null;
message.ResentFrom.Clear ();
message.ResentReplyTo.Clear ();
message.ResentTo.Clear ();
message.ResentCc.Clear ();
message.ResentBcc.Clear ();

// now add our own Resent-* headers...
message.ResentFrom.Add (new MailboxAddress ("MyName", "username@example.com"));
message.ResentReplyTo.Add (new MailboxAddress ("MyName", "username@example.com"));
message.ResentTo.Add (new MailboxAddress ("John Smith", "john@smith.com"));
message.ResentMessageId = MimeUtils.GenerateMessageId ();
message.ResentDate = DateTimeOffset.Now;

using (var client = new SmtpClient ()) {
    client.Connect ("smtp.example.com", 465, true);
    client.Authenticate ("username", "password");

    // The Send() method will use the Resent-From/To/Cc/Bcc headers if
    // they are present.
    client.Send (message);

    client.Disconnect (true);
}

3.通过将邮件(整体)附加到新邮件来转发邮件，某些电子邮件客户端可能会这样做.

var messageToForward = FetchMessageFromImapServer ();

// construct a new message
var message = new MimeMessage ();
message.From.Add (new MailboxAddress ("MyName", "username@example.com"));
message.ReplyTo.Add (new MailboxAddress ("MyName", "username@example.com"));
message.To.Add (new MailboxAddress ("John Smith", "john@smith.com"));
message.Subject = "FWD: " + messageToForward.Subject;

// now to create our body...
var builder = new BodyBuilder ();
builder.TextBody = "Hey John,

Here's that message I was telling you about...
";
builder.Attachments.Add (new MessagePart { Message = messageToForward });

message.Body = builder.ToMessageBody ();

using (var client = new SmtpClient ()) {
    client.Connect ("smtp.example.com", 465, true);
    client.Authenticate ("username", "password");

    client.Send (message);

    client.Disconnect (true);
}

4.转发消息inline"；许多其他电子邮件客户端的做法.

var messageToForward = FetchMessageFromImapServer ();

// construct a new message
var message = new MimeMessage ();
message.From.Add (new MailboxAddress ("MyName", "username@example.com"));
message.ReplyTo.Add (new MailboxAddress ("MyName", "username@example.com"));
message.To.Add (new MailboxAddress ("John Smith", "john@smith.com"));
message.Subject = "FWD: " + messageToForward.Subject;

// now to create our body...
var builder = new BodyBuilder ();

using (var writer = new StringWriter ()) {
    var sender = messageToForward.From.Mailboxes.FirstOrDefault () ?? messageToForward.Sender;
    var senderName = sender != null ? (!string.IsNullOrEmpty (sender.Name) ? sender.Name : sender.Address) : "someone";
    var text = messageToForward.TextBody ?? string.Empty;

    writer.WriteLine ("On {0}, {1} wrote:", messageToForward.Date, senderName);

    using (var reader = new StringReader (text)) {
        string line;

        while ((line = reader.ReadLine ()) != null) {
            writer.Write ("> ");
            writer.WriteLine (line);
        }
    }

    builder.TextBody = writer.ToString ();
}

message.Body = builder.ToMessageBody ();

using (var client = new SmtpClient ()) {
    client.Connect ("smtp.example.com", 465, true);
    client.Authenticate ("username", "password");

    client.Send (message);

    client.Disconnect (true);
}

这篇关于使用 MailKit (C#) 转发电子邮件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！