在名称中使用德语变音符号和逗号时，电子邮件接收器显示错误

发布于 2024-12-22 21:36:21 字数 2244 浏览 2 评论 0原文

使用 MailMessage 类< /a> 在 .NET 4 中，我今天发现了一个至今无法解决的问题。请参阅以下代码：

using (var message = new MailMessage())
{
    message.From = new MailAddress(@"[email protected]", "Uwe Keim");
    message.Bcc.Add(new MailAddress(@"[email protected]", "Uwe Keim"));

    // This fails (see screenshot).
    /*1*/ message.To.Add(new MailAddress(@"[email protected]", "Müller, Fred"));

    // This succeeds.
    /*2*/ message.To.Add(new MailAddress(@"[email protected]", "Fred Müller"));

    // This also succeeds.
    /*3*/ message.To.Add(new MailAddress(@"[email protected]", "Muller, Fred"));

    message.Subject = "Test";
    message.Body = "Some text body.";

    new SmtpClient().Send(message);
}

这是一个简单的代码片段，因此请发送一条 SMTP 消息。相互尝试 /*1*/、/*2*/ 和 /*3*/ 行，行为会有所不同

：（“收件人”）名称包含德语变音符号（即“Ä”、“Ö”或“Ü”）和逗号（即“,”），接收者会看到损坏的文本他收到的电子邮件：

在此处输入图像描述

正如您在上面的屏幕截图（取自 Outlook 2010）中看到的，有一个神秘的“=？utf- “收件人：”行中的“8？Q？M=C3=BCller”。

省略逗号或删除德语元音变音可以解决此问题。我尝试了 Exchange 2003 和 hmailserver 以获得相同的结果。

我的问题是：

有人知道这种行为并有解决方案吗？

更新 1：

根据用户 Adam Maras 的建议，我启动了 Microsoft Network Monitor，同时发送电子邮件。

对我来说，似乎 MailMessage 类（或 SmtpClient 类？）已经做错了：

在此处输入图像描述

原文

Using the MailMessage class in .NET 4, I found an issue today that I'm unable to resolve so far. Please see the following code:

using (var message = new MailMessage())
{
    message.From = new MailAddress(@"[email protected]", "Uwe Keim");
    message.Bcc.Add(new MailAddress(@"[email protected]", "Uwe Keim"));

    // This fails (see screenshot).
    /*1*/ message.To.Add(new MailAddress(@"[email protected]", "Müller, Fred"));

    // This succeeds.
    /*2*/ message.To.Add(new MailAddress(@"[email protected]", "Fred Müller"));

    // This also succeeds.
    /*3*/ message.To.Add(new MailAddress(@"[email protected]", "Muller, Fred"));

    message.Subject = "Test";
    message.Body = "Some text body.";

    new SmtpClient().Send(message);
}

This is a simple snippet so send an SMTP message. Mutually trying the lines /*1*/, /*2*/ and /*3*/, the behavior differs:

Whenever a receiver ("To") name contains a German umlaut (i.e. "Ä", "Ö" or "Ü") and a comma (i.e. ","), the receiver sees damaged text in the email message he receives:

enter image description here

As you can see in the above screenshot (taken from Outlook 2010), there is a cryptic "=?utf-8?Q?M=C3=BCller" in the "To:" line.

Leaving out the comma or removing the German umlaut fixes this. I've tried both Exchange 2003 and hmailserver to get the same result.

My question is:

Is anyone aware of this behaviour and has a solution to it?

Update 1:

As suggested by user Adam Maras, I fired up Microsoft Network Monitor while sending the email message.

To me, it seems that the MailMessage class (or the SmtpClient class?) is already doing it wrong:

enter image description here