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To preview a Laravel mailable without sending it, call render() for its HTML or return the mailable from a development-only route to view it in a browser. To test that your application asks Laravel to send the right message without contacting real recipients, use Mail::fake() and send assertions. These methods cover different things: rendered content, dispatch behavior, and captured transport output each need their own check.
Choose the right way to inspect a Laravel email
| Need | Use | What it checks |
|---|---|---|
| Get the evaluated HTML in code | render() |
The HTML produced by a mailable for the data you supplied. |
| See the design in a browser | Return the mailable from a protected development route | How the rendered message looks as a browser response; it does not send to an email address. |
| Check important copy or values | HTML and text mailable assertions | Whether expected content is present or absent in the relevant representation. |
| Check application dispatch safely | Mail::fake() and send assertions |
Whether the application requested that Laravel send the expected mailable. |
| Inspect a message passed through a development transport | A log driver or local SMTP catcher such as Mailpit | What the configured development transport captured. |
These checks are complementary. A browser preview does not show that application code dispatched the message; a send assertion does not assess the design; and a locally captured message does not establish inbox placement or production deliverability.
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Render the mailable to an HTML string
Use render() when you need the evaluated HTML in PHP—for example, to debug the output for specific view data or pass it to another local inspection step. Create a mailable with php artisan make:mail if you do not already have one; its content definition selects the Blade view or Markdown template and the data supplied to it. Laravel’s mail documentation describes both mailables and rendering.
$html = (new InvoicePaid($invoice))->render();This renders the mailable; it does not, by itself, deliver it to a recipient. Use representative fixture data when inspecting output, especially if the real message contains account or invoice details.
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Preview a mailable in a browser
For a quick visual check, a route can return a mailable object. Laravel renders it as the HTTP response, so you can inspect the layout without sending it to an email address.
Route::get('/dev/mail-preview', function () {
$invoice = Invoice::factory()->make();
return new InvoicePaid($invoice);
});This is an illustrative pattern: adapt the factory and route to your application. Keep preview routes out of public production access. Use non-sensitive sample data and restrict access to authorized developers; a route that renders real invoices or account messages can expose their contents to anyone who can reach it.
Test HTML and text content
Use mailable assertions to protect important content in automated tests. For example, check the HTML heading and a value in the plain-text alternative:
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$mailable = new InvoicePaid($invoice);
$mailable->assertSeeInHtml('Invoice Paid');
$mailable->assertSeeInText($invoice->number);Laravel’s mail documentation explains content assertions. Markdown mailables produce responsive HTML and automatically generate a plain-text counterpart, so assert against whichever representation matters to recipients rather than assuming an HTML check covers both.
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Test sending without contacting real recipients
Content checks and application dispatch checks answer separate questions. In a test of the behavior that triggers an email, fake the mailer before exercising that behavior, then assert that Laravel was asked to send the expected mailable.
Mail::fake();
// Trigger the application action that sends the message.
Mail::assertSent(InvoicePaid::class);Use the assertion supported by your installed Laravel version and test framework. Where recipient identity matters, add the available recipient-specific check. Laravel recommends separating tests of mailable content from tests of the code that sends it; see the mail testing documentation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Inspect a message captured by a local mail transport
A catcher is useful when you need to inspect the message as it passes through the configured development transport rather than only the rendered view. Laravel supports a log mail driver, which writes messages to application logs. For local SMTP capture, Laravel Sail’s documented default Compose configuration includes Mailpit: SMTP host mailpit, port 1025, and browser interface at http://localhost:8025. Sail also documents Mailtrap Local with default host mailtrap-local and port 3535. See the Sail documentation for those defaults.
Those settings apply to the documented Sail setup, not to every Laravel project. Check the running Compose services, .env, and config/mail.php before relying on a host or port; other projects may use a different catcher or transport.
Account for attachments and email-client differences
A browser response is not a full email-client test. Laravel 8.x documentation specifically notes that inline attachments are not rendered in its browser preview and recommends an email testing application for mailables that use them. Because that note is version-specific, check the documentation for your installed Laravel version and use a captured-message workflow when inline assets matter. See the Laravel 8.x mail documentation.
Likewise, a local catcher confirms what reached that catcher, not whether a production message will land in an inbox, avoid spam, or look identical across mailbox clients. Treat rendering, content assertions, dispatch assertions, and client or delivery evaluation as distinct checks.
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