从AWS SES发送附件少于10 MB的电子邮件

Question

我们正在使用AWS SES从C＃应用程序发送电子邮件。我们有一个大小为9.28MB的附件（PDF文件），当我们尝试发送带有附件的电子邮件时，它将引发以下异常：

System.Xml.XmlException: Root element is missing. at System.Xml.XmlTextReaderImpl.Throw(Exception e) at System.Xml.XmlTextReaderImpl.ParseDocumentContent() at Amazon.Runtime.Internal.Transform.UnmarshallerContext.Read() at Amazon.Runtime.Internal.Transform.ErrorResponseUnmarshaller.Unmarshall(UnmarshallerContext context) at Amazon.SimpleEmail.Model.Transform.SendRawEmailResponseUnmarshaller.UnmarshallException(UnmarshallerContext context, Exception innerException, HttpStatusCode statusCode) at Amazon.Runtime.AmazonWebServiceClient.processWebException[X,Y](String requestName, WebException we, HttpWebRequest webRequest, IResponseUnmarshaller`2 unmarshaller, IRequest`1 request, Int32 retries) at Amazon.Runtime.AmazonWebServiceClient.Invoke[X,Y](IRequest`1 request, AbstractAWSSigner signer, IResponseUnmarshaller`2 unmarshaller) at Amazon.SimpleEmail.AmazonSimpleEmailServiceClient.SendRawEmail(SendRawEmailRequest sendRawEmailRequest) at MyApp.AmazonSESWrapper.SendRawEmail(String awsAccessKey, String awsSecretKey, List`1 to, List`1 cc, List`1 bcc, String senderEmailAddress, String replyToEmailAddress, String subject, String body, String text, String filePath, String exceptionDetails)

但是，当我们发送7.50MB的word文档作为附件时，会出现以下异常：

Amazon.SimpleEmail.AmazonSimpleEmailServiceException: Message length is more than 10485760 bytes long: '10788624'. ---> System.Net.WebException: The remote server returned an error: (400) Bad Request. at System.Net.HttpWebRequest.GetResponse() at Amazon.Runtime.AmazonWebServiceClient.Invoke[X,Y](IRequest`1 request, AbstractAWSSigner signer, IResponseUnmarshaller`2 unmarshaller) --- End of inner exception stack trace --- at Amazon.Runtime.AmazonWebServiceClient.processWebException[X,Y](String requestName, WebException we, HttpWebRequest webRequest, IResponseUnmarshaller`2 unmarshaller, IRequest`1 request, Int32 retries) at Amazon.Runtime.AmazonWebServiceClient.Invoke[X,Y](IRequest`1 request, AbstractAWSSigner signer, IResponseUnmarshaller`2 unmarshaller) at Amazon.SimpleEmail.AmazonSimpleEmailServiceClient.SendRawEmail(SendRawEmailRequest sendRawEmailRequest) at 

从“论坛”和“常见问题解答”中可以看到，最大附件大小为10MB，但少于10MB的附件也会发生错误。

https://forums.aws.amazon.com/thread.jspa?messageID=346305

http://aws.amazon.com/ses/faqs/#49

请对此提出建议。

Answer 1

也有整个邮件大小限制，也就是10M。根据http://aws.amazon.com/ses/faqs/：

Amazon SES将接受最大10 MB的电子邮件。这包括邮件中的所有附件。

因此，您必须确保您的请求符合这些限制。

（我个人认为这是Amazon API抛出“ XmlException：缺少根元素”的错误。以防万一消息大小大大超出了限制。这完全是误导。）