Use PHPMailer with SMTP for reliable email delivery by installing via Composer, configuring SMTP settings, and sending emails with authentication. 2. Utilize PHP’s built-in mail() function if the server has a configured MTA, though proper DNS records are needed to avoid spam filters. 3. Integrate third-party email services like SendGrid or Mailgun via API for better scalability and deliverability by obtaining an API key, using the SDK to send emails, and monitoring delivery through dashboards or webhooks.

If you need to send emails using PHP, several methods can help achieve reliable delivery. Here are the ways to implement this functionality:

The operating environment of this tutorial: Dell XPS 15, Windows 11

1. Using PHPMailer with SMTP

PHPMailer is a widely used library that simplifies the process of sending emails via SMTP, offering better reliability and support for authentication, encryption, and attachments.

• Download PHPMailer via Composer by running: composer require phpmailer/phpmailer
• Include the autoload file in your script: require 'vendor/autoload.php';
• Create a new PHPMailer instance and configure SMTP settings such as host, port, encryption (TLS/SSL), username, and password
• Set the sender, recipient, subject, and body of the email
• Use $mail->isSMTP() to enable SMTP and send the message using $mail->send()

2. Utilizing the Built-in mail() Function

The native mail() function in PHP allows sending emails directly from the server without external libraries, but requires proper server configuration for effective delivery.

• Ensure your server has a configured MTA (Mail Transfer Agent) like Sendmail or a local SMTP service
• Call the function using mail($to, $subject, $message, $headers), where headers include From, Reply-To, and Content-Type
• Be aware that emails sent via mail() may end up in spam folders if the server lacks proper DNS records (SPF, DKIM)
• Test the function with a valid recipient address and check error logs if delivery fails

3. Integrating Third-Party Email Services via API

Sending emails through APIs from services like SendGrid, Mailgun, or Amazon SES provides scalability, tracking, and improved deliverability compared to traditional methods.

• Sign up for an account with a provider and obtain an API key
• Install the provider’s SDK using Composer—for example, composer require sendgrid/sendgrid
• Construct the email payload including sender, recipient, subject, and content (HTML or plain text)
• Send the request using the SDK's mail sending method and handle the response for success or errors
• Monitor delivery status through the service dashboard or webhook notifications