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Direct Mail:SMTP-PHP

Last Updated:Sep 19, 2022

This topic describes how to construct PHP functions and call the fucntions to send emails over SMTP. 

Construct and call PHP functions to send emails over SMTP

Method 1: Use the external dependency phpmailer. 

Download the following files from GitHub: PHPMailer.php, Exception.php, and SMTP.php. 

If it is in another language, please modify the following parameter in the PHPMailer.php file to change the encoding format(Take Chinese as an example):

public $CharSet = self::CHARSET_ISO88591; 

The preceding encoding format is changed to the following encoding format:

public $CharSet = self::CHARSET_UTF8;

Sample code for sending emails:

<?php
require 'PHPMailer.php';
require 'Exception.php';
require 'SMTP.php';


$mail = new PHPMailer(true);

try {
    //Server settings
    $mail->Charset='UTF-8';
    $mail->SMTPDebug = SMTP::DEBUG_SERVER;                      
    $mail->isSMTP();                                            
    $mail->Host       = 'ssl://smtpdm.aliyun.com';                     // The server of Direct Mail.
    $mail->Port       = 465;                                    // The port number.
    //$mail->Host       = 'smtpdm.aliyun.com';                     
    //$mail->Port       = 80;                                    
    $mail->SMTPAuth   = true;                                   // Grant permissions.
    $mail->Username   = 'Sender@demo.aliyun.com';                     // The sender address.
    $mail->Password   = '*******';                               //The SMTP password.
    $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;         // Enable encryption.
    //Recipients
    $mail->setFrom('Sender@demo.aliyun.com', 'Mailer');   // The display sender address. You can also configure a proxy sender. 
    $mail->addAddress('Address@demo.aliyun.com', 'name');     // The email address and nickname of the recipient.
    //$mail->addAddress('Address@demo.aliyun.com');               // The nickname is optional.
    //$mail->addAddress('Address2@demo.aliyun.com', 'name2');// Add the $mail->addAddress field to add a recipient.
    $mail->addReplyTo('Address@demo.aliyun.com', 'Information');// The reply-to address.
    $mail->addCC('Address@demo.aliyun.com');// The address in the CC field.
    $mail->addBCC('Address@demo.aliyun.com');// The address in the BCC field.

    //Attachments
    //$mail->addAttachment('C:/Users/Documents/test.jpg');         // Add an attachment.
    $mail->addAttachment('C:/Users/Documents/test.jpg', 'new.jpg');    // The attachment name is optional.

    //Content
    $mail->isHTML(true);                                  // The HTML format.
    $mail->Subject = 'Test title';
    $mail->Body    = 'Test content';
    //$mail->AltBody = 'This is the body in plain text for non-HTML mail clients';

    $mail->Sender = 'Sender@demo.aliyun.com';
    echo 'Message has been sent';
    $mail->send();
    echo 'Message has been sent';
} catch (Exception $e) {
    echo "Message could not be sent. Mailer Error: {$mail->ErrorInfo}";
}
?>

Method 2: Use the external dependency email.class.php

<?php
require 'email.class.php';

$mailto='Recipient address';
$mailsubject="Test email";
$mailbody='Email content ';

$smtpserver     = "smtpdm.aliyun.com";
$smtpserverport = 80;
// $smtpserver= "ssl://smtpdm.aliyun.com";
// $smtpserverport = 465;
$smtpusermail   = "Sender address";

// The account of the sender. Enter the sender address that you specified in the console. Example: xxx@xxx.com.
$smtpuser       = "Sender account";
// The password that is used to access SMTP. You can select the sender address in the console to specify the password.
$smtppass       = "***";

$mailsubject    = "=?UTF-8?B?" . base64_encode($mailsubject) . "?=";
$mailtype       = "HTML";

// Optional. The reply-to address.
$smtpreplyto    = "***";

$smtp           = new smtp($smtpserver, $smtpserverport, true, $smtpuser, $smtppass);
$smtp->debug    = false;
$cc   ="";
$bcc  = "";
$additional_headers = "";
// The name of the sender. You can specify a name as needed. 
$sender = "Sender";
$smtp->sendmail($mailto,$smtpusermail, $mailsubject, $mailbody, $mailtype, $cc, $bcc, $additional_headers, $sender, $smtpreplyto);
?>

You must modify the settings in the email.class.php dependency based on your business requirements.

$header .=”Reply-To: “.$replyToAddress.”\r\n”;// $replyToAddress is equivalent to $smtpreplyto. 

Notes:

  • email.class.php is an external dependency that can be downloaded over the Internet. 

  • mailto specifies the email address of the recipient. 

  • smtpuser specifies the complete sender address. 

Sample settings of email.class.php

<?php

/**
 * email smtp (support php7)
 *
 */


class Smtp
{
    /* Public Variables */
    public $smtp_port;

    public $time_out;

    public $host_name;

    public $log_file;

    public $relay_host;

    public $debug;

    public $auth;

    public $user;

    public $pass;

    /* Private Variables */
    private $sock;

    /* Constractor */
    function __construct($relay_host = "", $smtp_port = 80,$auth = false,$user,$pass)
    {
        $this->debug = FALSE;

        $this->smtp_port = $smtp_port;

        $this->relay_host = $relay_host;

        $this->time_out = 30; //is used in fsockopen()


        $this->auth = $auth;//auth

        $this->user = $user;

        $this->pass = $pass;


        $this->host_name = "localhost"; //is used in HELO command
        $this->log_file = "";

        $this->sock = FALSE;

    }

    /* Main Function */

    function sendmail($to, $from, $subject, $body, $mailtype, $cc, $bcc, $additional_headers, $fromUser, $replyToAddress)
    {

        $mail_from = $this->get_address($this->strip_comment($from));

        $body = preg_replace("/(^|(\r\n))(\.)/", "\1.\3", $body);

        $header = "MIME-Version:1.0\r\n";

        if($mailtype=="HTML"){

            $header .= "Content-Type:text/html; charset=utf-8\r\n";

        }

        $header .= "To: ".$to."\r\n";

        if ($cc != "") {

            $header .= "Cc: ".$cc."\r\n";

        }

        $header .= "From: $fromUser<".$from.">\r\n";

        $header .= "Subject: ".$subject."\r\n";

        $header .= "Reply-To: ".$replyToAddress."\r\n";

        $header .= $additional_headers;

        $header .= "Date: ".date("r")."\r\n";

        $header .= "X-Mailer:By Redhat (PHP/".phpversion().")\r\n";

        list($msec, $sec) = explode(" ", microtime());

        $header .= "Message-ID: <".date("YmdHis", $sec).".".($msec*1000000).".".$mail_from.">\r\n";

        // If you want to enable the email tracking feature, use the following sample code to configure the SMTP header for tracking. For information about the related prerequisites and limits, see "How can I enable the data tracking feature?"
        //$header .= "Content-Transfer-Encoding: quoted-printable\r\n";
        //$header .= "X-AliDM-Trace: ". base64_encode(json_encode(['TagName'=>'Custom Tag','OpenTrace'=>"1"]))."\r\n";
        $TO = explode(",", $this->strip_comment($to));

        if ($cc != "") {

            $TO = array_merge($TO, explode(",", $this->strip_comment($cc)));

        }

        if ($bcc != "") {

            $TO = array_merge($TO, explode(",", $this->strip_comment($bcc)));

        }

        $sent = TRUE;

        foreach ($TO as $rcpt_to) {

            $rcpt_to = $this->get_address($rcpt_to);

            if (!$this->smtp_sockopen($rcpt_to)) {

                $this->log_write("Error: Cannot send email to ".$rcpt_to."\n");

                $sent = FALSE;

                continue;

            }

            if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) {

                $this->log_write("E-mail has been sent to <".$rcpt_to.">\n");

            } else {

                $this->log_write("Error: Cannot send email to <".$rcpt_to.">\n");

                $sent = FALSE;

            }

            fclose($this->sock);

            $this->log_write("Disconnected from remote host\n");

        }

        return $sent;

    }

    /* Private Functions */

    function smtp_send($helo, $from, $to, $header, $body = "")
    {

        if (!$this->smtp_putcmd("HELO", $helo)) {

            return $this->smtp_error("sending HELO command");

        }

        //auth
        if($this->auth){

            if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))) {

                return $this->smtp_error("sending HELO command");

            }

            if (!$this->smtp_putcmd("", base64_encode($this->pass))) {

                return $this->smtp_error("sending HELO command");

            }

        }


        if (!$this->smtp_putcmd("MAIL", "FROM:<".$from.">")) {

            return $this->smtp_error("sending MAIL FROM command");

        }

        if (!$this->smtp_putcmd("RCPT", "TO:<".$to.">")) {

            return $this->smtp_error("sending RCPT TO command");

        }

        if (!$this->smtp_putcmd("DATA")) {

            return $this->smtp_error("sending DATA command");

        }

        if (!$this->smtp_message($header, $body)) {

            return $this->smtp_error("sending message");

        }

        if (!$this->smtp_eom()) {

            return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]");

        }

        if (!$this->smtp_putcmd("QUIT")) {

            return $this->smtp_error("sending QUIT command");

        }

        return TRUE;

    }

    function smtp_sockopen($address)
    {

        if ($this->relay_host == "") {

            return $this->smtp_sockopen_mx($address);

        } else {

            return $this->smtp_sockopen_relay();

        }

    }

    function smtp_sockopen_relay()
    {

        $this->log_write("Trying to ".$this->relay_host.":".$this->smtp_port."\n");

        $this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out);

        if (!($this->sock && $this->smtp_ok())) {

            $this->log_write("Error: Cannot connenct to relay host ".$this->relay_host."\n");

            $this->log_write("Error: ".$errstr." (".$errno.")\n");

            return FALSE;

        }

        $this->log_write("Connected to relay host ".$this->relay_host."\n");

        return TRUE;

    }

    function smtp_sockopen_mx($address)
    {

        $domain = preg_replace("/^.+@([^@]+)$/", "\1", $address);

        if (!@getmxrr($domain, $MXHOSTS)) {

            $this->log_write("Error: Cannot resolve MX \"".$domain."\"\n");

            return FALSE;

        }

        foreach ($MXHOSTS as $host) {

            $this->log_write("Trying to ".$host.":".$this->smtp_port."\n");

            $this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out);

            if (!($this->sock && $this->smtp_ok())) {

                $this->log_write("Warning: Cannot connect to mx host ".$host."\n");

                $this->log_write("Error: ".$errstr." (".$errno.")\n");

                continue;

            }

            $this->log_write("Connected to mx host ".$host."\n");

            return TRUE;

        }

        $this->log_write("Error: Cannot connect to any mx hosts (".implode(", ", $MXHOSTS).")\n");

        return FALSE;

    }

    function smtp_message($header, $body)
    {

        fputs($this->sock, $header."\r\n".$body);

        $this->smtp_debug("> ".str_replace("\r\n", "\n"."> ", $header."\n> ".$body."\n> "));

        return TRUE;

    }

    function smtp_eom()
    {

        fputs($this->sock, "\r\n.\r\n");

        $this->smtp_debug(". [EOM]\n");

        return $this->smtp_ok();

    }

    function smtp_ok()
    {

        $response = str_replace("\r\n", "", fgets($this->sock, 512));

        $this->smtp_debug($response."\n");

        if (!preg_match("/^[23]/", $response)) {

            fputs($this->sock, "QUIT\r\n");

            fgets($this->sock, 512);

            $this->log_write("Error: Remote host returned \"".$response."\"\n");

            return FALSE;

        }

        return TRUE;

    }

    function smtp_putcmd($cmd, $arg = "")
    {

        if ($arg != "") {

            if($cmd=="") $cmd = $arg;

            else $cmd = $cmd." ".$arg;

        }

        fputs($this->sock, $cmd."\r\n");

        $this->smtp_debug("> ".$cmd."\n");

        return $this->smtp_ok();

    }

    function smtp_error($string)
    {

        $this->log_write("Error: Error occurred while ".$string.".\n");

        return FALSE;

    }

    function log_write($message)
    {

        $this->smtp_debug($message);

        if ($this->log_file == "") {

            return TRUE;

        }

        $message = date("M d H:i:s ").get_current_user()."[".getmypid()."]: ".$message;

        if (!@file_exists($this->log_file) || !($fp = @fopen($this->log_file, "a"))) {

            $this->smtp_debug("Warning: Cannot open log file \"".$this->log_file."\"\n");

            return FALSE;

        }

        flock($fp, LOCK_EX);

        fputs($fp, $message);

        fclose($fp);


        return TRUE;

    }


    function strip_comment($address)
    {

        $comment = "/\([^()]*\)/";

        while (preg_match($comment, $address)) {

            $address = preg_replace($comment, "", $address);

        }

        return $address;

    }


    function get_address($address)
    {

        $address = preg_replace("/([ \t\r\n])+/", "", $address);

        $address = preg_replace("/^.*<(.+)>.*$/", "\1", $address);

        return $address;

    }

    function smtp_debug($message)
    {

        if ($this->debug) {

            echo $message;

        }

    }

}
?>