使用 Amazon AWS SMTP 发送带附件的电子邮件

Question

我正在尝试使用亚马逊 WS SMTP 发送电子邮件，发送成功但我从未收到电子邮件。当我发送没有附件时，我成功收到了。

这是我的代码

// Create an SMTP client with the specified host name and port.
        using (SmtpClient client = new SmtpClient(ssHost, ssPort))
        {
            // Create a network credential with your SMTP user name and password.
            client.Credentials = new System.Net.NetworkCredential(ssSMTP_Username, ssSMTP_Password);

            // Use SSL when accessing Amazon SES. The SMTP session will begin on an unencrypted connection, and then 
            // the client will issue a STARTTLS command to upgrade to an encrypted connection using SSL.
            client.EnableSsl = true;
            // Send the email. 

            MailMessage message = new MailMessage();
            try
            {
                //creates a messages with the all data
                message.From = new MailAddress(ssFrom, ssFromName);
                //message.To.Add(ssTo);
                //To
                List<String> toAddresses = ssTo.Split(',').ToList();
                foreach (String toAddress in toAddresses)
                {
                    message.To.Add(new MailAddress(toAddress));
                }
                //cc
                List<String> ccAddresses = ssCC.Split(',').Where(y => y != "").ToList();
                foreach (String ccAddress in ccAddresses)
                {
                    message.CC.Add(new MailAddress(ccAddress));
                }
                //bcc
                List<String> BccAddresses = ssBcc.Split(',').Where(y => y != "").ToList();
                foreach (String ccAddress in ccAddresses)
                {
                    message.Bcc.Add(new MailAddress(ccAddress));
                }

                //replyTo
                if (ssReplyTo != null)
                {
                    message.ReplyToList.Add(new MailAddress(ssReplyTo));
                }

                //email
                message.Subject = ssSubject;
                message.Body = ssBody;
                message.IsBodyHtml = true;


                //Attachment
                foreach (RCAttachmentRecord attchmentRec in ssAttachmenstList){
                    System.IO.MemoryStream ms = new System.IO.MemoryStream(attchmentRec.ssSTAttachment.ssBinary);
                    Attachment attach = new Attachment(ms, attchmentRec.ssSTAttachment.ssFilename);
                    message.Attachments.Add(attach);

                    ssErrorMessage = ssErrorMessage + "||" + attchmentRec.ssSTAttachment.ssFilename+"lenght:"+attchmentRec.ssSTAttachment.ssBinary.Length;
                }
                client.Send(message);

            }

来源：http://docs.aws.amazon.com/ses/latest/DeveloperGuide/send-using-smtp-net.html

Answer 1

我认为您的问题可能是您没有将附件正确添加到邮件中。

我成功发送了一封带有附件的邮件。我从直接取自 your source link above. I then added the code from another SO article about the missing content type problem.

的代码开始

附件是我的文档文件夹中的一个 Word 文档Lebowski.docx。我建议您创建一个类似的简单 Word 文档和 运行 下面的代码来验证您可以在一封电子邮件中发送一个简单的附件。

以下代码对我来说很成功：

namespace SESTest
{
using System;
using System.Net.Mail;

namespace AmazonSESSample
{
    class Program
    {
        static void Main(string[] args)
        {
            const String FROM = "from-email";   // Replace with your "From" address. This address must be verified.
            const String TO = "to-email";  // Replace with a "To" address. If your account is still in the
                                                        // sandbox, this address must be verified.

            const String SUBJECT = "Amazon SES test (SMTP interface accessed using C#)";
            const String BODY = "This email and attachment was sent through the Amazon SES SMTP interface by using C#.";

            // Supply your SMTP credentials below. Note that your SMTP credentials are different from your AWS credentials.
            const String SMTP_USERNAME = "user-creds";  // Replace with your SMTP username. 
            const String SMTP_PASSWORD = "password";  // Replace with your SMTP password.

            // Amazon SES SMTP host name. 
            const String HOST = "your-region.amazonaws.com";

            // The port you will connect to on the Amazon SES SMTP endpoint. We are choosing port 587 because we will use
            // STARTTLS to encrypt the connection.
            const int PORT = 2587;

            // Create an SMTP client with the specified host name and port.
            using (System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient(HOST, PORT))
            {
                // Create a network credential with your SMTP user name and password.
                client.Credentials = new System.Net.NetworkCredential(SMTP_USERNAME, SMTP_PASSWORD);

                // Use SSL when accessing Amazon SES. The SMTP session will begin on an unencrypted connection, and then 
                // the client will issue a STARTTLS command to upgrade to an encrypted connection using SSL.
                client.EnableSsl = true;

                // Send the email. 
                try
                {
                    Console.WriteLine("Attempting to send an email through the Amazon SES SMTP interface...");

                    var mailMessage = new MailMessage()
                    {
                        Body = BODY,
                        Subject = SUBJECT,
                        From = new MailAddress(FROM)
                    };
                    mailMessage.To.Add(new MailAddress(TO));

                    //REMOVE THIS CODE
                    //System.IO.MemoryStream ms = new System.IO.MemoryStream(attchmentRec.ssSTAttachment.ssBinary);
                    //Attachment attach = new Attachment(ms, attchmentRec.ssSTAttachment.ssFilename);
                    //mailMessage.Attachments.Add(attach);

                    System.Net.Mime.ContentType contentType = new System.Net.Mime.ContentType();
                    contentType.MediaType = System.Net.Mime.MediaTypeNames.Application.Octet;
                    contentType.Name = "Lebowski.docx";
                    mailMessage.Attachments.Add(new Attachment("C:\users\luis\Documents\Lebowski.docx", contentType));

                    client.Send(mailMessage);

                    Console.WriteLine("Email sent!");
                }
                catch (Exception ex)
                {
                    Console.WriteLine("The email was not sent.");
                    Console.WriteLine("Error message: " + ex.Message);
                }
            }

            Console.Write("Press any key to continue...");
            Console.ReadKey();
        }
    }
}
}

一旦你证明你可以从你的帐户发送一封带有一个附件的电子邮件，那么你就可以开始研究如何从你的 ssAttachmentsList 中获取二进制文件到你的电子邮件中，并为每个文件分配正确的内容类型.但是您目前没有提供足够的代码或上下文让我确定这一点。我希望这段代码能帮助您解决依恋问题。