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我在 Synology DiskStation 上有一个邮件服务器。我想使用 php 发送电子邮件，但 PHP 邮件功能不起作用。我读过 Synology 邮件服务器使用 ESMTP 而 PHP 使用 sendmail，所以邮件功能不起作用，我需要使用直接 SMTP 构建我的消息。我找到了这个：

<?php
function myMail($from, $namefrom, $to, $nameto, $subject, $message) {
$smtpServer = "xxx.xxx.xxx.xxx";   
$port = "25";                    
$timeout = "45";                 // typical timeout. try 45 for slow servers
$username = "user@example.com";
$password = "secret";           
$localhost = "example.com";      
$newLine = "\r\n";
$secure = 0;
$smtpConnect = fsockopen($smtpServer, $port, $errno, $errstr, $timeout);
$smtpResponse = fgets($smtpConnect, 4096);
if(empty($smtpConnect)) {
   $output = "Failed to connect: $smtpResponse";
   echo $output;
   return $output;
}
else {
   $logArray['connection'] = "<p>Connected to: $smtpResponse";
   echo "<p />connection accepted<br>".$smtpResponse."<p />Continuing<p />";
}
fputs($smtpConnect, "HELO $localhost". $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['heloresponse2'] = "$smtpResponse";
fputs($smtpConnect,"AUTH LOGIN" . $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['authrequest'] = "$smtpResponse";
fputs($smtpConnect, base64_encode($username) . $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['authusername'] = "$smtpResponse";
fputs($smtpConnect, base64_encode($password) . $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['authpassword'] = "$smtpResponse";
fputs($smtpConnect, "MAIL FROM: <$from>" . $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['mailfromresponse'] = "$smtpResponse";
fputs($smtpConnect, "RCPT TO: <$to>" . $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['mailtoresponse'] = "$smtpResponse";
fputs($smtpConnect, "DATA" . $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['data1response'] = "$smtpResponse";
$headers = "MIME-Version: 1.0" . $newLine;
$headers .= "Content-type: text/html; charset=iso-8859-1" . $newLine;
$headers .= "To: $nameto <$to>" . $newLine;
$headers .= "From: $namefrom <$from>" . $newLine;
fputs($smtpConnect, "To: $to\r\nFrom: $from\r\nSubject: $subject\r\n$headers\r\n\r\n$message\r\n.\r\n");
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['data2response'] = "$smtpResponse";

fputs($smtpConnect,"QUIT" . $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['quitresponse'] = "$smtpResponse";
$logArray['quitcode'] = substr($smtpResponse,0,3);
fclose($smtpConnect);
//a return value of 221 in $retVal["quitcode"] is a success
return($logArray);
}

它返回：
connection accepted 220 example.com ESMTP Postfix

继续
但我的电子邮件没有到达。谢谢你的帮助。

注意：主机名已替换为 example.com

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