All 7 Email Sending in PHP (PHPMailer & SMTP) questions
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How does PHP's built in mail function work, and why is it generally not recommended for production applications? 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 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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How do you send an HTML formatted email with an embedded image or attachment using PHPMailer?

Intermediate

Answer

PHPMailer lets you set the isHTML method to true to send richly formatted HTML content instead of plain text, and it provides an addAttachment method for including file attachments, along with support for embedding images directly within the HTML body using a content identifier reference, giving you full control over creating professional looking, richly formatted transactional emails.
$mail->isHTML(true);
$mail->Body = '<h1>Welcome!</h1><p>Thanks for joining us.</p>';
$mail->addAttachment('/path/to/invoice.pdf');
Real-world example An e commerce platform sends order confirmation emails as nicely formatted HTML with the company logo embedded directly in the email and the customer's invoice attached as a PDF file, providing a professional experience compared to a plain text email.

Common follow-ups: How do you embed an image directly within the email body rather than as an attachment?;What happens if a recipient's email client does not support HTML formatting?

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