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【Cs】Send Email (寄信)

文前言

紀錄一些寄信寫法

主文

MailKit

官方文件：

  1. Introduction
  2. Creating messages
    • (裡面也有附上如何附檔的寫法)

那麼如果檔案不是實體路徑而是 Stream 的話

using (Stream contentStream 
    = (await request.GetResponseAsync()).GetResponseStream())
{
    MemoryStream memoryStream = new MemoryStream();
    await contentStream.CopyToAsync(memoryStream);
    memoryStream.Position = 0;

    // create an image attachment for the file located at path
    MimePart attachment = new MimePart("application", "pdf")
    {
        Content = new MimeContent(memoryStream, ContentEncoding.Default),
        ContentDisposition 
            = new ContentDisposition(ContentDisposition.Attachment),
        ContentTransferEncoding = ContentEncoding.Base64,
        FileName = ...
    };

    // Note: it is important that the text/html part is added second, because it is the
    // most expressive version and (probably) the most faithful to the sender's WYSIWYG 
    // editor.
    MultipartAlternative alternative = new MultipartAlternative();
    alternative.Add(body);

    // now create the multipart/mixed container to hold the multipart/alternative
    // and the image attachment
    Multipart multipart = new Multipart("mixed")
    {
        alternative,
        attachment
    };

    // now set the multipart/mixed as the message body
    message.Body = multipart;
}

這裡的寫法有參照官方文件 + Claude
另外我要傳的檔案是 pdf，所以 new MimePart() 接取的參數有所調整。

TextPart() 參數

下圖是來自官方程式碼：

body 常用的就是 plain、html

SMTP

官方文件：System.Net.Mail 命名空間 | Microsoft Learn

網路上文件很多，都能找到，就不放了。

UPDATE LOG

115. 06/17 開新篇