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因爲任何與之合作的人都知道，要通過帶有附件的Amazon SES C＃SDK發送電子郵件，您必須使用SendRawEmail函數（其中非常臭）。爲此，您要麼手動編碼MIME郵件，要麼將其轉換爲MemoryStream。這一切工作正常，但我遇到了一個問題。經過多次挖掘，我已經能夠找到問題並複製它，並且它似乎是SMTP點填充的副產品。使用C＃SDK時使用亞馬遜SES，附件和點填充技術的雙期問題
問題是，在某些情況下，當MailMessage被轉換爲原始MIME消息時，如果消息正文中的句點被封裝到原始消息中的行的開頭，則它是點填充的（正確我假設）。但是，它似乎並沒有在SDK內部或SES端處理，因爲電子郵件通過雙重時間段。這可以通過下面的示例控制檯應用程序代碼被複制...
static void Main(string[] args)
{
var to = new List<string> { _toAddress };
var subject = "TEST MESSAGE";
var message = $"This is a carefully crafted HTML email message body such that you should see a single period right here ->. However, you'll see <strong>two periods</strong> in the email instead of one period like originally given in the code.";
var body = $"<br />Hello,<br /><br />{message}<br /><br />Sincerely,<br /><br />Your Tester";
var result = SendEmail(to, subject, body, null, isHtml: true);
Console.WriteLine(result ? "Successfully sent message" : "Failed to send message");
if (Debugger.IsAttached)
{
Console.WriteLine("Press any key to continue...");
Console.ReadLine();
}
}
private static bool SendEmail(List<string> to, string subject, string body, List<string> attachmentFilePaths = null, bool isHtml = false)
{
var message = new MailMessage
{
From = new MailAddress(_fromAddress),
Subject = subject,
Body = body,
IsBodyHtml = isHtml
};
foreach (var address in to)
{
message.To.Add(address.Trim());
}
if (attachmentFilePaths?.Any() == true)
{
foreach (var filePath in attachmentFilePaths)
{
message.Attachments.Add(new Attachment(filePath));
}
}
try
{
var creds = new BasicAWSCredentials(_SESAccessKey, _SESSecretKey);
using (var client = new AmazonSimpleEmailServiceClient(creds, RegionEndpoint.USEast1))
{
var request = new SendRawEmailRequest { RawMessage = new RawMessage { Data = ConvertMailMessageToMemoryStream(message) } };
Console.WriteLine($"RawMessage.Data...\r\n\r\n{Encoding.ASCII.GetString(request.RawMessage.Data.ToArray())}");
client.SendRawEmail(request);
return true;
}
}
catch (Exception ex)
{
Console.WriteLine($"AmazonSESHelper.SendEmail => Exception: {ex.Message}");
}
return false;
}
// Have to do this reflection crap in order to send attachments to the SES API
// From http://stackoverflow.com/questions/29532152/create-mime-mail-with-attachment-for-aws-ses-c-sharp/29533336#29533336
private static MemoryStream ConvertMailMessageToMemoryStream(MailMessage message)
{
var stream = new MemoryStream();
var assembly = typeof(SmtpClient).Assembly;
var mailWriterType = assembly.GetType("System.Net.Mail.MailWriter");
var mailWriterConstructor = mailWriterType.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { typeof(Stream) }, null);
var mailWriter = mailWriterConstructor.Invoke(new object[] { stream });
var sendMethod = typeof(MailMessage).GetMethod("Send", BindingFlags.Instance | BindingFlags.NonPublic);
sendMethod.Invoke(message, BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { mailWriter, true, true }, null);
var closeMethod = mailWriter.GetType().GetMethod("Close", BindingFlags.Instance | BindingFlags.NonPublic);
closeMethod.Invoke(mailWriter, BindingFlags.Instance | BindingFlags.NonPublic, null, new object[] { }, null);
return stream;
}
是被輸出的是原始的MIME消息...
X-Sender: [email protected]
X-Receiver: [email protected]
MIME-Version: 1.0
From: [email protected]
To: [email protected]
Date: 2 Dec 2016 11:45:36 -0500
Subject: TEST MESSAGE
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: quoted-printable
<br />Hello,<br /><br />This is a carefully crafted HTML email me=
ssage body such that you should see a single period right here ->=
.. However, you'll see <strong>two periods</strong> in the email i=
nstead of one period like originally given in the code.<br /><br =
/>Sincerely,<br /><br />Your Tester
你可以看到點餡（再次，假設這是每個SMTP適當的），但它並不會發送，當我收到的電子郵件可以看出後未完成的...
我可以得到，如果這個工作我添加@jstedfast MimeKit（這很棒），但在我們所有的應用程序中添加了另一個依賴項，這不是我最喜歡做的事情。在此之前，我想把它扔在這裏看看是否有什麼我失蹤。如果沒有，那麼很高興看到SES承認這是一個問題並加以解決。否則，我必須在另一個庫依賴關係之間做出決定，或者跳出SES到另一個郵件提供者。