# boolean_smtp_transports

> Filters the map of registered transport drivers.

Filter · Tier A · Since 1.0.0

Return a modified array to register, replace, or remove transports.

## Signature

```php
add_filter( 'boolean_smtp_transports', $callback, 10, 1 );
```

## Parameters

| Name | Type | Description |
| --- | --- | --- |
| `$registered` | `array<string, class-string<\BooleanSmtp\Contracts\TransportContract>>` | Transport classes keyed by driver name. |

**Returns** `array<string, class-string<\BooleanSmtp\Contracts\TransportContract>>` — The filtered transport map, keyed by driver name.

## Fires in

- [app/Services/Mailer/MailerManager.php:658](https://github.com/booleanpress/boolean-smtp-src/blob/main/app/Services/Mailer/MailerManager.php#L658) — `BooleanSmtp\Services\Mailer\MailerManager::getTransports()`

## Example

```php
add_filter( 'boolean_smtp_transports', function ( array $registered ) {
    return $registered;
}, 10, 1 );
```