Cakephp 3 Cake\Network\Email configTransport Issue - email

Question

I'm using Cake\Network\Email\Email class to send some emails.
I have successfully send an email with my smtp configuration that I put on config/app.php
The problem is that I don't want the config to be there.
I have this piece of code:
function enviacorreo($email, $asunto, $content, $cc=null) {
Email::configTransport('gmail', [
'port'=>$smtpport,
'timeout'=>'30',
'host' => $smtp,
'username'=>$smtpuser,
'password'=>$smtppasswd
]);
$email_obj = new Email();
$email_obj->template('default')
->emailFormat('html')
->to($email)
->from([$smtpuser => $nombreSistema])
->subject($asunto)
->transport('gmail');
if($email_obj->send($content))
return array('exito'=>1,'error'=>'Ninguno');
else
return array('exito'=>0,'error'=>'El correo no pudo ser enviado');
}
I'm following the official book here
The error that I get is this:
Transport config "gmail" is missing.
I know that ->transport('gmail'); is looking for a key inside the EmailTransport array definded in app.php
But. How can I have this 'configuration' in my code?
Hope to explained well.

Answer 1

The error message is a little misleading, as the exception is not only being thrown in case the configuration missing, but also in case the className option is missing, which is the case in your example (#7204).
If you look closely at the docs, you should see that you haven't followed it correctly.
[...]
// Sample smtp configuration.
Email::configTransport('gmail', [
'host' => 'ssl://smtp.gmail.com',
'port' => 465,
'username' => 'my#gmail.com',
'password' => 'secret',
'className' => 'Smtp' // <------ there it is
]);
[...]
Cookbook > Email > Configuring Transports