The world's most popular PHP email sending library for secure and reliable SMTP delivery.
PHPMailer is a robust, full-featured email creation and transfer class for PHP, widely recognized as the industry standard for sending email from within PHP-based applications. While PHP provides a native mail() function, it is notoriously unreliable and lacks support for modern security protocols. PHPMailer solves this by providing a comprehensive Object-Oriented interface for SMTP, supporting SSL/TLS encryption, multi-part MIME attachments, and high-performance mailing. In the 2026 technical landscape, PHPMailer remains critical for legacy and modern PHP systems alike, acting as the primary integration layer for cloud-based SMTP relays such as Amazon SES, SendGrid, and Mailgun. Its architecture is designed to handle complex requirements like DKIM signing, OAuth2 authentication (specifically for Google and Microsoft environments), and embedded images (CID). As security standards for email delivery tighten globally, PHPMailer's active maintenance ensures it stays compliant with evolving RFC standards, making it the go-to choice for developers requiring granular control over their email headers and transport layers without the overhead of proprietary SaaS SDKs.
Maintains a persistent connection to the SMTP server for sending multiple messages.
Verified feedback from the global deployment network.
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Cryptographically signs outgoing emails to verify the sender's domain.
Supports XOAUTH2 authentication for Google, Microsoft, and Yahoo.
Automatically handles Content-ID headers for inline images in HTML emails.
Supports error reporting in over 50 languages.
Automatically handles line breaks and character set encoding (UTF-8).
Allows developers to add arbitrary X-Headers or List-Unsubscribe headers.
Reliably sending order confirmations and invoices with PDF attachments.
Registry Updated:2/7/2026
Log success in DB
Ensuring high-speed delivery of time-sensitive OTP codes.
Safe processing of user input into formatted emails without header injection vulnerabilities.