Send Email with PHP using SMTP Authentication

The following example demonstrates how to send email using PHP with SMTP authentication. This script connects directly to the Fast2Host mail server, authenticates with your credentials, and sends an email message.

Sample PHP Script

<?php
// Example usage
$to = "to@fast2host.com";
$nameto = "Recipient Name";
$from = "from@fast2host.com";
$namefrom = "Sender Name";
$subject = "Hello World Again!";
$message = "World, Hello!";
authSendEmail($from, $namefrom, $to, $nameto, $subject, $message);

// Function to send email with SMTP authentication
function authSendEmail($from, $namefrom, $to, $nameto, $subject, $message)
{
    // SMTP + Server Details
    $smtpServer = "mail.YOUR-DOMAIN.com";
    $port = 25; // Use 49 (Windows hosting) or 26 (Linux hosting) if port 25 is blocked
    $timeout = 30;
    $username = "your-email@domain.com";
    $password = "yourpassword";
    $localhost = "mail.YOUR-DOMAIN.com";
    $newLine = "\r\n";

    // Connect to SMTP server
    $smtpConnect = fsockopen($smtpServer, $port, $errno, $errstr, $timeout);
    $smtpResponse = fgets($smtpConnect, 515);
    if (empty($smtpConnect)) {
        return "Failed to connect: $smtpResponse";
    }

    // Authenticate
    fputs($smtpConnect, "AUTH LOGIN" . $newLine);
    fgets($smtpConnect, 515);
    fputs($smtpConnect, base64_encode($username) . $newLine);
    fgets($smtpConnect, 515);
    fputs($smtpConnect, base64_encode($password) . $newLine);
    fgets($smtpConnect, 515);

    // Say Hello
    fputs($smtpConnect, "HELO $localhost" . $newLine);
    fgets($smtpConnect, 515);

    // Mail From / RCPT To
    fputs($smtpConnect, "MAIL FROM: $from" . $newLine);
    fgets($smtpConnect, 515);
    fputs($smtpConnect, "RCPT TO: $to" . $newLine);
    fgets($smtpConnect, 515);

    // Send Data
    fputs($smtpConnect, "DATA" . $newLine);
    fgets($smtpConnect, 515);

    // Construct Headers
    $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\nFrom: $from\nSubject: $subject\n$headers\n\n$message\n.\n");
    fgets($smtpConnect, 515);

    // Quit
    fputs($smtpConnect, "QUIT" . $newLine);
    fgets($smtpConnect, 515);
}
?>
  

Configuration Notes

Best Practices