All 7 Email Sending in PHP (PHPMailer & SMTP) questions
More in Email Sending in PHP (PHPMailer & SMTP)
What is PHPMailer, and what advantages does it provide over PHP's built in mail function for sending emails reliably? What is SMTP authentication, and why is properly configuring it important for ensuring email deliverability? How do SPF, DKIM, and DMARC email authentication records help improve email deliverability and prevent your domain from being used for email spoofing? How do you send an HTML formatted email with an embedded image or attachment using PHPMailer? How should an application handle email sending failures gracefully, and why is sending emails asynchronously through a queue often preferred over sending them directly during a web request? What security considerations should be addressed when building an application feature that sends emails based on user input, such as a contact form or password reset flow?
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PHP › Email Sending in PHP (PHPMailer & SMTP)

How does PHP's built in mail function work, and why is it generally not recommended for production applications?

Beginner

Answer

PHP's built in mail function sends an email by relying on the server's local mail transfer agent, but it offers limited control over important details like proper authentication, formatting, and delivery tracking, and emails sent this way are also significantly more likely to be marked as spam by receiving mail servers, which is why most production applications instead use a dedicated library like PHPMailer that connects directly to a properly authenticated SMTP server.
mail('user@example.com', 'Subject', 'Message body');
Real-world example A developer testing a quick prototype uses PHP's built in mail function for simplicity, but before launching the actual product, switches to PHPMailer with a proper SMTP provider to ensure emails reliably reach customers' inboxes instead of their spam folders.

Common follow-ups: Why do emails sent through PHP's mail function often end up in spam folders?;What server configuration does the mail function actually depend on?

Form Handling & Validation;Security
All 7 Email Sending in PHP (PHPMailer & SMTP) questions