I'm currently working on a Symfony 4 application and I need to send emails throught Swift Mailer. When I send an email, I receive the email spooled but I don't get it in my Gmail Mailbox. I allowed unsecure apps in my gmail configuration.
This is my mailer URL from .env file : MAILER_URL=gmail://ep****@gmail.com:PASSWORD@localhost
This is my swiftmailer.yaml:
    #config/packages/swiftmailer.yaml
    swiftmailer:
        url: '%env(MAILER_URL)%'
        spool: { type: 'memory' }
This is my controller function:

This is the documentation I've followed : http://symfony.com/doc/current/email.html
I've checked these questions but they don't give me the answer : How to send emails with Symfony 4 Swiftmailer from a local machine running on Windows 10? , mailer symfony 4 not working
Please, I need help. I've looked for the solution all day long. I get no errors but I don't receive the mail. Thanks in advance. Any link can help me.
Problem solved!! Put this configuration instead of using the URL env variable
swiftmailer:
    transport:        gmail
    username:         ****@gmail.com
    password:         *******
    host:             localhost
    port:             465
    encryption:       ssl
    auth-mode:        login
    spool: { type: 'memory' }
    stream_options:
        ssl:
            allow_self_signed: true
            verify_peer: false
            verify_peer_name: false
                        Late to the party, but the URL format requires full settings. I don't think SwiftMailer parses the URL to detect a specific transport (like gmail) to configure the reset by itself.
The following format worked for me:
MAILER_URL=smtp://smtp.gmail.com:587?encryption=tls&username=USERNAME&password=PASSWORD
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