How to add headers to email in Laravel 5.1
Stefan Bogdanescu
Founder & Senior Architect · 2026-06-29
# How to Add Custom Headers to Emails in Laravel 5.1
As developers working with the Laravel ecosystem, managing email delivery—especially ensuring proper headers are present for services like Mailgun—is a crucial step. When you need to enforce specific headers across all outgoing emails, particularly when integrating with third-party services, it often requires looking beyond simple configuration and diving into how Laravel constructs its mailables.
This post will provide a comprehensive, developer-focused guide on achieving your goal: adding a custom header like `x-mailgun-native-send: true` to every email sent in a Laravel 5.1 application.
***
## Understanding Email Headers in Laravel
Laravel utilizes the underlying Symfony Mailer component to handle all outgoing email operations. When you send an email using the `Mail` facade, the system constructs the MIME message based on the Mailable class you define. To inject custom headers that are recognized by external services, you generally need to manipulate the properties of the mail object or extend the base functionality.
There is no single global setting in Laravel 5.1 that automatically prefixes every email with a specific header unless you configure your entire underlying mail driver globally. However, the most flexible and recommended approach for adding context-specific headers is within the Mailable class itself.
## The Recommended Approach: Modifying the Mailable Class
The best practice when dealing with custom headers is to place the logic directly within the Mailable class. This ensures that the header is attached to *only* the emails that require it, keeping your code clean and maintainable. If you need this header on *all* emails, you can implement a trait or extend the base Mailable class to handle this injection automatically.
For our specific requirement—adding `x-mailgun-native-send: true` universally—we can leverage the `build()` method within the Mailable to modify the message headers before it is sent.
### Code Example Implementation
Here is how you would structure a Mailable class in Laravel 5.1 to ensure this header is present on every email generated by that class:
```php
setHeader('x-mailgun-native-send', 'true');
return $message;
}
}
```
### Using the Custom Mailable
Now, whenever you send an email using this `BaseMail` class, the required header will be automatically included:
```php
use App\Mail\BaseMail;
// ... inside your controller or service
Mail::send(new BaseMail());
```
This method is highly effective because it encapsulates the header logic directly with the email content itself. As we strive for clean architecture in Laravel, ensuring that custom logic resides within the domain objects, rather than relying on global side effects, aligns perfectly with best practices discussed by the team at [laravelcompany.com](https://laravelcompany.com).
## Best Practices and Conclusion
While modifying the Mailable is the most direct way to add specific headers, if you find yourself needing this header on *every* email across your entire application (e.g., for a strict integration requirement), consider creating a custom Mailer or Service Provider that hooks into the sending process. This approach centralizes the logic and prevents code duplication throughout your codebase.
In summary, for Laravel 5.1, injecting headers is best achieved by manipulating the message object within the Mailable's `build()` method. This provides control, clarity, and maintainability. By adopting this pattern, you ensure that your email delivery system remains robust, regardless of which third-party service you integrate with. Always prioritize clear, encapsulated logic when managing data flow in Laravel; it makes debugging significantly easier!