我有一个应用程序，可以通过 SMTP 服务器 (sendgrid) 发送带有图像附件的电子邮件。
当应用程序启动时，它会初始化一个 Socket 连接并验证用户(应用程序)。我看到从 Sendgrid 返回的以下消息
SG ESMTP service ready at<foo..sendgrid.net
并且我还得到了成功的身份验证返回。
但是，在发送电子邮件时，我收到以下 3 个错误:
error 1 550 Unauthenticated senders not allowed
error 2 503 Must have sender before recipient
error 3 503 Must have valid receiver and originator
因此，这表明我必须更改 SMTP 模块中发件人和收件人的顺序。在内部，我正在获取传入的 ByteArray 并转换为 base64 字符串，以便发送带有附加文件的电子邮件。
那么我如何更改以下代码摘录？
writeUTFBytes ("MAIL FROM: <"+pFrom+">\r\n");
writeUTFBytes ("RCPT TO: <"+pDest+">\r\n");
writeUTFBytes ("DATA\r\n");
writeUTFBytes ("From: "+pFrom+"\r\n");
writeUTFBytes ("To: "+pDest+"\r\n");
这是我正在使用的整个类。我在类初始化后仅调用一次authenticate，然后在发送带有图像附件的电子邮件时调用sendAttachedMail。当使用没有身份验证的本地 SMTP 服务器进行测试时，一切正常(发送电子邮件和图像附件)
package org.bytearray.smtp.mailer
{
import flash.events.ProgressEvent;
import flash.net.Socket;
import flash.utils.ByteArray;
import flash.utils.getTimer;
import org.bytearray.smtp.crypto.MD5;
import org.bytearray.smtp.encoding.Base64;
import org.bytearray.smtp.events.SMTPEvent;
import org.bytearray.smtp.infos.SMTPInfos;
public class SMTPMailer extends Socket
{
private var sHost:String;
private var buffer:Array = new Array();
// regexp pattern
private var reg:RegExp = /^\d{3}/img;
// PNG, JPEG header values
private static const PNG:Number = 0x89504E47;
private static const JPEG:Number = 0xFFD8;
// common SMTP server response codes
// other codes could be added to add fonctionalities and more events
private static const ACTION_OK:Number = 0xFA;
private static const AUTHENTICATED:Number = 0xEB;
private static const DISCONNECTED:Number = 0xDD;
private static const READY:Number = 0xDC;
private static const DATA:Number = 0x162;
private static const BAD_SEQUENCE:Number = 0x1F7;
public function SMTPMailer ( pHost:String, pPort:int)
{
super ( pHost, pPort );
sHost = pHost;
addEventListener(ProgressEvent.SOCKET_DATA, socketDataHandler,false,0,true);
}
public function reset():void{
removeEventListener(ProgressEvent.SOCKET_DATA, socketDataHandler);
}
/*
* This method lets you authenticate, just pass a login and password
*/
public function authenticate ( pLogin:String, pPass:String ):void
{
writeUTFBytes ("EHLO "+sHost+"\r\n");
writeUTFBytes ("AUTH LOGIN\r\n");
writeUTFBytes (Base64.encode64String (pLogin)+"\r\n");
writeUTFBytes (Base64.encode64String (pPass)+"\r\n");
flush();
}
/*
* This method is used to send emails with attached files and HTML
* takes an incoming Bytearray and convert it to base64 string
* for instance pass a JPEG ByteArray stream to get a picture attached in the mail ;)
*/
public function sendAttachedMail ( pFrom:String, pDest:String, pSubject:String, pMess:String, pByteArray:ByteArray, pFileName:String ) :void
{
try {
writeUTFBytes ("HELO "+sHost+"\r\n");
writeUTFBytes ("MAIL FROM: <"+pFrom+">\r\n");
writeUTFBytes ("RCPT TO: <"+pDest+">\r\n");
writeUTFBytes ("DATA\r\n");
writeUTFBytes ("From: "+pFrom+"\r\n");
writeUTFBytes ("To: "+pDest+"\r\n");
writeUTFBytes ("Date : "+new Date().toString()+"\r\n");
writeUTFBytes ("Subject: "+pSubject+"\r\n");
writeUTFBytes ("Mime-Version: 1.0\r\n");
var md5Boundary:String = MD5.hash ( String ( getTimer() ) );
writeUTFBytes ("Content-Type: multipart/mixed; boundary=------------"+md5Boundary+"\r\n");
writeUTFBytes("\r\n");
writeUTFBytes ("This is a multi-part message in MIME format.\r\n");
writeUTFBytes ("--------------"+md5Boundary+"\r\n");
writeUTFBytes ("Content-Type: text/html; charset=UTF-8; format=flowed\r\n");
writeUTFBytes("\r\n");
writeUTFBytes (pMess+"\r\n");
writeUTFBytes ("--------------"+md5Boundary+"\r\n");
writeUTFBytes ( readHeader (pByteArray, pFileName) );
writeUTFBytes ("Content-Transfer-Encoding: base64\r\n");
writeUTFBytes ("\r\n");
var base64String:String = Base64.encode64 ( pByteArray, true );
writeUTFBytes ( base64String+"\r\n");
writeUTFBytes ("--------------"+md5Boundary+"-\r\n");
writeUTFBytes (".\r\n");
flush();
} catch ( pError:Error )
{
trace("Error : Socket error, please check the sendAttachedMail() method parameters");
trace("Arguments : " + arguments );
}
}
/*
* This method is used to send HTML emails
* just pass the HTML string to pMess
*/
public function sendHTMLMail ( pFrom:String, pDest:String, pSubject:String, pMess:String ):void
{
try
{
writeUTFBytes ("HELO "+sHost+"\r\n");
writeUTFBytes ("MAIL FROM: <"+pFrom+">\r\n");
writeUTFBytes ("RCPT TO: <"+pDest+">\r\n");
writeUTFBytes ("DATA\r\n");
writeUTFBytes ("From: "+pFrom+"\r\n");
writeUTFBytes ("To: "+pDest+"\r\n");
writeUTFBytes ("Subject: "+pSubject+"\r\n");
writeUTFBytes ("Mime-Version: 1.0\r\n");
writeUTFBytes ("Content-Type: text/html; charset=UTF-8; format=flowed\r\n");
writeUTFBytes("\r\n");
writeUTFBytes (pMess+"\r\n");
writeUTFBytes (".\r\n");
flush();
} catch ( pError:Error )
{
trace("Error : Socket error, please check the sendHTMLMail() method parameters");
trace("Arguments : " + arguments );
}
}
/*
* This method automatically detects the header of the binary stream and returns appropriate headers (jpg, png)
* classic application/octet-stream content type is added for different kind of files
*/
private function readHeader ( pByteArray:ByteArray, pFileName:String ):String
{
pByteArray.position = 0;
var sOutput:String = null;
if ( pByteArray.readUnsignedInt () == SMTPMailer.PNG )
{
sOutput = "Content-Type: image/png; name="+pFileName+"\r\n";
sOutput += "Content-Disposition: attachment filename="+pFileName+"\r\n";
return sOutput;
}
pByteArray.position = 0;
if ( pByteArray.readUnsignedShort() == SMTPMailer.JPEG )
{
sOutput = "Content-Type: image/jpeg; name="+pFileName+"\r\n";
sOutput += "Content-Disposition: attachment filename="+pFileName+"\r\n";
return sOutput;
}
sOutput = "Content-Type: application/octet-stream; name="+pFileName+"\r\n";
sOutput += "Content-Disposition: attachment filename="+pFileName+"\r\n";
return sOutput;
}
// check SMTP response and dispatch proper events
// Keep in mind SMTP servers can have different result messages the detection can be modified to match some specific SMTP servers
private function socketDataHandler ( pEvt:ProgressEvent ):void
{
var response:String = pEvt.target.readUTFBytes ( pEvt.target.bytesAvailable );
buffer.length = 0;
var result:Array = reg.exec(response);
while (result != null)
{
buffer.push (result[0]);
result = reg.exec(response);
}
var smtpReturn:Number = buffer[buffer.length-1];
var smtpInfos:SMTPInfos = new SMTPInfos ( smtpReturn, response );
if ( smtpReturn == SMTPMailer.READY )
dispatchEvent ( new SMTPEvent ( SMTPEvent.CONNECTED, smtpInfos ) );
else if ( smtpReturn == SMTPMailer.ACTION_OK && (response.toLowerCase().indexOf ("queued") != -1 || response.toLowerCase().indexOf ("accepted") != -1 ||
response.toLowerCase().indexOf ("qp") != -1) ) dispatchEvent ( new SMTPEvent ( SMTPEvent.MAIL_SENT, smtpInfos ) );
else if ( smtpReturn == SMTPMailer.AUTHENTICATED )
dispatchEvent ( new SMTPEvent ( SMTPEvent.AUTHENTICATED, smtpInfos ) );
else if ( smtpReturn == SMTPMailer.DISCONNECTED )
dispatchEvent ( new SMTPEvent ( SMTPEvent.DISCONNECTED, smtpInfos ) );
else if ( smtpReturn == SMTPMailer.BAD_SEQUENCE )
dispatchEvent ( new SMTPEvent ( SMTPEvent.BAD_SEQUENCE, smtpInfos ) );
else if ( smtpReturn != SMTPMailer.DATA )
dispatchEvent ( new SMTPEvent ( SMTPEvent.MAIL_ERROR, smtpInfos ) );
}
}
}
最佳答案
So this suggests to me that I must change the order of sender and recipient in my SMTP module.
您的命令顺序是正确的。相反，您应该查看第一条错误消息以了解问题的真正原因:
error 1 550 Unauthenticated senders not allowed
这告诉您 server requires authentication来自发件人，即使用带有用户凭据的 SMTP AUTH 命令。未经身份验证的发件人尝试发送邮件将被拒绝。因此，如果 MAIL FROM 失败，则 RCPT TO 也会失败。如果RCPT TO失败，则DATA失败。等等。
使用 SMTP EHLO 命令发现服务器支持的 AUTH 方案(和其他功能)，然后发送适当的 AUTH发送MAIL FROM之前的命令。
关于sockets - SMTP 邮件服务器 (sendgrid) 提交时出错，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39901300/