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Productivity & Docs
Swift Mailer
Swift Mailer logo
Productivity & Docs

Swift Mailer

Swift Mailer is a feature-rich, object-oriented library for sending emails from PHP applications. It provides a flexible and powerful system for creating, sending, and tracking emails, supporting various transports like SMTP, Sendmail, and mail(). Developers use it to integrate robust email functionality into websites, content management systems, and custom web applications, handling tasks from simple notifications to complex, templated marketing campaigns. It solves problems related to email reliability, formatting, and attachment handling by abstracting low-level details into a clean PHP API. Historically a cornerstone of the Symfony ecosystem, it has been a go-to solution for PHP developers needing programmatic email control. However, as of late 2021, Swift Mailer has entered maintenance mode and is no longer actively developed, with users encouraged to migrate to its successor, Symfony Mailer, which is built with modern PHP practices and offers improved performance and features.

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📊 At a Glance

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Productivity & Docs
Email Management

Key Features

Multiple Transport Support

Supports sending emails via SMTP, Sendmail, and the native PHP mail() function, allowing developers to choose the best method for their hosting environment and reliability needs.

Object-Oriented Message API

Offers a fluent, object-oriented interface (Swift_Message) for constructing emails, setting headers, body content, and attachments in a structured and intuitive way.

Plugin System

Includes a plugin architecture that allows developers to intercept and modify the email sending process for logging, throttling, anti-flooding, and other custom behaviors.

MIME Compliance & Attachments

Automatically handles MIME encoding for international characters, HTML emails with inline images, and file attachments (both from disk and dynamic data streams).

Event-Driven Architecture

Employs an event dispatcher that fires events at key points in the sending lifecycle (e.g., before sending, on failure), allowing for custom hooks and listeners.

Pricing

Open Source

$0
  • ✓Full access to the entire Swift Mailer library source code.
  • ✓Ability to send emails via SMTP, Sendmail, and mail() transports.
  • ✓Support for HTML emails, attachments, embedded images, and multipart messages.
  • ✓Plugin system for logging, throttling, and anti-flooding.
  • ✓Event-driven architecture for customizing the sending process.
  • ✓No user or seat limits; can be used in unlimited projects.
  • ✓Community support via GitHub issues and Stack Overflow.

Use Cases

1

User Account Management Emails

Web developers integrate Swift Mailer to automate transactional emails for user registration, email verification, and password reset flows. By composing messages with dynamic tokens and links, it ensures reliable delivery of critical account-related communications. This improves user experience and security by providing timely, professional-looking emails directly from the application's backend.

2

E-commerce Order Notifications

Online store platforms use Swift Mailer to send order confirmations, shipping updates, and invoice receipts to customers. The library's attachment support allows for PDF invoice inclusion, while its HTML capabilities enable branded, templated emails that enhance customer trust and reduce support inquiries regarding order status.

3

Marketing Newsletter Campaigns

Content management systems and custom marketing tools leverage Swift Mailer to batch-send HTML newsletters to subscriber lists. Its support for embedded images and CSS-inlining helps create visually appealing campaigns. While not a dedicated ESP, it provides a programmatic foundation for building simple, self-hosted newsletter systems.

4

System Monitoring & Alerting

DevOps engineers and system administrators configure Swift Mailer within monitoring scripts and applications to send alert emails for server downtime, error logs, or performance thresholds. The reliability of SMTP transport ensures critical alerts reach the right team members, facilitating quick incident response.

5

Application Feedback & Contact Forms

Website contact forms and in-app feedback modules use Swift Mailer to route user submissions to appropriate support or sales teams. It securely handles user-input data, can attach uploaded files, and formats the message for easy tracking within team email clients, streamlining communication workflows.

How to Use

  1. Step 1: Install Swift Mailer into your PHP project using Composer by running the command `composer require swiftmailer/swiftmailer` in your terminal.
  2. Step 2: Configure the mailer transport within your application, typically by creating a Swift_SmtpTransport, Swift_SendmailTransport, or Swift_MailTransport instance and setting the necessary host, port, and authentication details.
  3. Step 3: Create a Swift_Mailer instance, passing the configured transport object to it. This object becomes your primary interface for sending messages.
  4. Step 4: Compose an email message using the Swift_Message class, setting the sender, recipients, subject, body (in plain text and/or HTML), and any file attachments.
  5. Step 5: Invoke the `send()` method on the Swift_Mailer instance, passing the composed message object. The library will handle the delivery via the configured transport.
  6. Step 6: Optionally, use plugins (like Swift_Plugins_LoggerPlugin or Swift_Plugins_ThrottlerPlugin) to add logging, throttling, or other behaviors to the sending process.
  7. Step 7: For production workflows, integrate the sending logic into your application's controllers, services, or event listeners to automate emails for user registration, password resets, order confirmations, or newsletters.
  8. Step 8: Monitor sending results and handle potential failures by catching exceptions (like Swift_TransportException) and implementing retry logic or fallback transports as needed.

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