Mail not sent with MailCatcher

I have installed MailCatcher in my Symofny 4.2 project.

I have configured it in my .env file:

MAILER_URL=http://127.0.0.1:1080/

And in swiftmailer.yml

swiftmailer:    url: '%env(MAILER_URL)%'    spool: { type: 'memory' }parameters:    mailer_transport: smtp    mailer_host: 127.0.0.1    mailer_user: null    mailer_password: null    mailer_port: 1025

When I open that url, mail inbox loads correctly.

I trigger my __invoke function while persisting some entity and want to catch mail I am sending.

I am using API platform so it's tricky to find out where the problem is.

Here is an error:

Entity is peristed in the db but mail has not been send.

I tried changing the response but no luck. I am stuck with this error.

public function __invoke(){$transport = (new Swift_SmtpTransport('127.0.0.1', 1025));    $mailer = new Swift_Mailer($transport);    $message = (new \Swift_Message('Hello Email'))        ->setFrom('send@example.com')        ->setTo('recipient@example.com')        ->setBody('My <em>name</em> is Filip', 'text/plain');    $mailer->send($message);    return new JsonResponse(['result' => 'ok']);   }}