# PHPMailer/PHPMailer

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22,028 stars · 9,859 forks · PHP · lgpl-2.1

## Links

- GitHub: https://github.com/PHPMailer/PHPMailer
- awesome-repositories: https://awesome-repositories.com/repository/phpmailer-phpmailer.md

## Topics

`attachment` `email` `hacktoberfest` `php` `php-library` `phpmailer` `smtp` `tls-support` `xoauth2`

## Description

PHPMailer is a comprehensive library for constructing and sending complex email messages within PHP applications. It provides an object-oriented framework for building MIME-compliant emails, managing attachments, and handling multi-format content such as HTML and plain-text alternatives. The library serves as a robust interface for email dispatch, supporting both individual messaging and high-performance bulk distribution through persistent connections.

The project distinguishes itself through a deep focus on secure transmission and identity verification. It integrates advanced security protocols including TLS encryption, OAuth2 authentication, and cryptographic signing via DKIM or SMIME to ensure message integrity and sender authenticity. Furthermore, the library incorporates defensive routines to sanitize attachment filenames and validate recipient addresses, effectively mitigating common risks like header injection and unauthorized file access.

Beyond core delivery, the library offers extensive configuration options for SMTP transport, including custom port management and pluggable authentication providers. It also features built-in support for internationalization, error reporting with localized feedback, and automated archiving of sent messages. The architecture is designed for extensibility, allowing developers to inject modular components or override default behaviors to suit specific messaging requirements.

## Tags

### Web Development

- [Email Libraries](https://awesome-repositories.com/f/web-development/email-libraries.md) — A library for constructing and sending complex emails with support for SMTP, attachments, HTML content, and secure authentication protocols.

### Development Tools & Productivity

- [SMTP Clients](https://awesome-repositories.com/f/development-tools-productivity/client-libraries/smtp-clients.md) — A component for connecting to mail servers to dispatch messages using secure transport layers and modern authentication methods like OAuth2.
- [Email Attachments](https://awesome-repositories.com/f/development-tools-productivity/email-attachments.md) — Includes files or raw data as email attachments by reading from local storage or database records. ([source](https://github.com/PHPMailer/PHPMailer/blob/master/examples/mailing_list.phps))

### Networking & Communication

- [Bulk Email Dispatchers](https://awesome-repositories.com/f/networking-communication/bulk-email-dispatchers.md) — Sends personalized messages to large groups of recipients using persistent connections for optimized performance.
- [Email Delivery Services](https://awesome-repositories.com/f/networking-communication/email-delivery-services.md) — The library builds email messages with support for attachments and various encodings before transmitting them to mail servers for final delivery. ([source](https://github.com/PHPMailer/PHPMailer/blob/master/composer.json))
- [Email Server Configuration](https://awesome-repositories.com/f/networking-communication/email-server-configuration.md) — Connects applications to external mail servers using secure authentication and custom transport settings.
- [MIME Message Construction](https://awesome-repositories.com/f/networking-communication/mime-message-construction.md) — Constructs MIME-compliant multipart messages for rich content delivery.
- [Transport Configurations](https://awesome-repositories.com/f/networking-communication/communication-protocols-architectures/communication-protocols-standards/network-transport-layers/transport-configurations.md) — The library connects to external mail servers using authentication and custom port settings to route outgoing messages through specific network infrastructure. ([source](https://github.com/PHPMailer/PHPMailer/blob/master/examples/mailing_list.phps))
- [Multipart Email Formatters](https://awesome-repositories.com/f/networking-communication/multipart-email-formatters.md) — Constructs messages containing both HTML and plain-text alternatives for consistent readability. ([source](https://github.com/PHPMailer/PHPMailer/tree/5.2-stable))
- [Recipient Configurations](https://awesome-repositories.com/f/networking-communication/bulk-email-dispatchers/recipient-configurations.md) — The library configures primary, carbon copy, blind carbon copy, and reply-to addresses to facilitate individual or bulk message distribution. ([source](https://github.com/PHPMailer/PHPMailer#readme))

### Content Management & Publishing

- [Rich Text Email Composers](https://awesome-repositories.com/f/content-management-publishing/authoring-editorial-interfaces/email-authoring-tools/rich-text-email-composers.md) — Builds complex messages supporting HTML, plain text, attachments, and inline media with full character encoding. ([source](https://github.com/PHPMailer/PHPMailer/blob/master/README.md))

### Security & Cryptography

- [Email Signing](https://awesome-repositories.com/f/security-cryptography/code-signing/email-signing.md) — A toolkit for signing outgoing messages with DKIM or SMIME and validating recipient addresses to ensure integrity and prevent injection. ([source](https://github.com/PHPMailer/PHPMailer/tree/master/examples))
- [Mail Transmission Security](https://awesome-repositories.com/f/security-cryptography/secure-network-communication/mail-transmission-security.md) — Protects outgoing communications through TLS encryption, OAuth2, and cryptographic signing.
- [Digital Signature Libraries](https://awesome-repositories.com/f/security-cryptography/digital-signature-libraries.md) — Applies digital signatures to outgoing messages to ensure sender identity and data integrity during transit.
- [Input Validation & Sanitization](https://awesome-repositories.com/f/security-cryptography/input-validation-sanitization.md) — Sanitizes and validates attachment file paths to prevent unauthorized access and injection vulnerabilities.
- [OAuth2 Providers](https://awesome-repositories.com/f/security-cryptography/oauth2-providers.md) — The library connects to email service providers using modern authorization tokens instead of static passwords to improve security and support multi-factor authentication. ([source](https://github.com/PHPMailer/PHPMailer/blob/master/composer.json))
- [Security Hardening and Protection](https://awesome-repositories.com/f/security-cryptography/security/utilities/security-hardening-and-protection.md) — Prevents header injection and unauthorized file access by validating inputs during message construction.
- [Authentication Providers](https://awesome-repositories.com/f/security-cryptography/authentication-providers.md) — Supports multiple authentication mechanisms, including OAuth2 and legacy protocols, through interchangeable security handlers.
- [Transport Security Configurations](https://awesome-repositories.com/f/security-cryptography/transport-security-configurations.md) — Manages SSL and TLS settings for encrypted communication, including certificate verification requirements. ([source](https://github.com/PHPMailer/PHPMailer/tree/master/examples))
- [Path Access Restrictions](https://awesome-repositories.com/f/security-cryptography/security/policies/host-resource-access/file-system-access-controls/path-access-restrictions.md) — Blocks URL-style protocols and remote path schemes to prevent unauthorized local file access. ([source](https://github.com/PHPMailer/PHPMailer/blob/master/SECURITY.md))
- [Filename Sanitizers](https://awesome-repositories.com/f/security-cryptography/file-upload-security/attachment-security-validators/filename-sanitizers.md) — Sanitizes attachment filenames to prevent security filter bypasses and ensure compliance with email protocol requirements. ([source](https://github.com/PHPMailer/PHPMailer/blob/master/SECURITY.md))

### Data & Databases

- [File Attachment Systems](https://awesome-repositories.com/f/data-databases/data-management/document-record-handling/file-attachment-systems.md) — Manages local files and binary data as attachments with support for custom display names. ([source](https://github.com/PHPMailer/PHPMailer/search))

### Software Engineering & Architecture

- [Internationalization Libraries](https://awesome-repositories.com/f/software-engineering-architecture/localization/internationalization-libraries.md) — Supports universal character encoding to ensure correct display of non-English text globally. ([source](https://github.com/PHPMailer/PHPMailer/blob/master/SMTPUTF8.md))
- [Transport Abstractions](https://awesome-repositories.com/f/software-engineering-architecture/transport-abstractions.md) — Decouples message composition from specific delivery protocols using a modular class hierarchy.
- [Format Validators](https://awesome-repositories.com/f/software-engineering-architecture/email-fields/format-validators.md) — Validates email address formats using internal logic while preventing arbitrary code execution. ([source](https://github.com/PHPMailer/PHPMailer/blob/master/SECURITY.md))
- [Error Handling Utilities](https://awesome-repositories.com/f/software-engineering-architecture/error-handling-utilities.md) — Provides structured error reporting and exception handling to manage transmission failures programmatically.
- [Transmission Error Reporting](https://awesome-repositories.com/f/software-engineering-architecture/error-handling/transmission-error-reporting.md) — The library catches and processes email delivery failures through automated status reporting or exception handling routines to ensure reliable communication workflows. ([source](https://github.com/PHPMailer/PHPMailer/tree/master/examples))
- [Extensible Processing Pipelines](https://awesome-repositories.com/f/software-engineering-architecture/extensible-processing-pipelines.md) — Allows customization of email processing behavior by injecting modular components into the message handling pipeline. ([source](https://github.com/PHPMailer/PHPMailer/tree/master/examples))

### User Interface & Experience

- [Content Embedding Tools](https://awesome-repositories.com/f/user-interface-experience/content-embedding-tools.md) — Embeds documents, inline images, and calendar events within messages while supporting various character encodings. ([source](https://github.com/PHPMailer/PHPMailer#readme))