New in Symfony 6.1: Draft Emails

Contributed by
Kevin Bond

in #44311.

In HTML it’s possible to create email links that, when clicked, open a new
email message with some pre-filled information rather than linking to some other page:

<!– creates an empty email with only the recipient address pre-filled –>
<a href=„mailto:[email protected]>Send email</a>

<!– creates an email with most of its elements pre-filled –>
<a href=„mailto:[email protected]
[email protected]
&[email protected]

Send email

However, sometimes you need to create a full email, with lots of contents and
even file attachments. You can’t do that with the mailto: feature. That’s
why Symfony 6.1 will add a feature to create draft emails.

Draft emails are email messages created as a file with the .eml extension
and with the X-Unsent header set. This allows email clients to interpret
them as draft emails that you can use to create the email to be sent.

First, use the new DraftEmail class to create those emails:

use SymfonyComponentMimeDraftEmail;

$message = (new DraftEmail())
// …

Now you can define a controller that downloads this draft email as a .eml file:

// src/Controller/DownloadEmailController.php
namespace AppController;

use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentHttpFoundationResponse;
use SymfonyComponentHttpFoundationResponseHeaderBag;
use SymfonyComponentMimeDraftEmail;
use SymfonyComponentRoutingAnnotationRoute;

class BudgetController extends AbstractController
public function estimateGenerator(): Response
// …

$message = (new DraftEmail())
->subject(‚Your estimate is now available‘)

$response = new Response($message->toString());
$contentDisposition = $response->headers->makeDisposition(
$response->headers->set(‚Content-Type‘, ‚message/rfc822‘);
$response->headers->set(‚Content-Disposition‘, $contentDisposition);

return $response;

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