Merry Christmas everyone,

i try to use Symfony Mailer (5.3) on my Web Host Hetzner, where the port 465 is blocked. So i must use the port 587 and i have try it with Sendgrid DSN like
MAILER_DSN=sendgrid+smtp://API_KEY@smtp.sendgrid.net:587

and also i have trying from gmail:
MAILER_DSN=gmail+smtp://test@gmail.com:password@smtp.gmail.com:587?verify_peer=0

(both also without +smtp, but nothing changed)

Both one produces an Error with the following message:
[2021-12-25T09:43:13.271464+01:00] request.CRITICAL: Uncaught PHP Exception Symfony\Component\Messenger\Exception\HandlerFailedException: "Handling "Symfony\Component\Mailer\Messenger\SendEmailMessage" failed: Connection could not be established with host "ssl://smtp.gmail.com:465": stream_socket_client(): Unable to connect to ssl://smtp.gmail.com:465 (Connection refused)" at /usr/www/users/[username]/[domain]/vendor/symfony/messenger/Middleware/HandleMessageMiddleware.php line 80 {"exception":"[object] (Symfony\\Component\\Messenger\\Exception\\HandlerFailedException(code: 0): Handling \"Symfony\\Component\\Mailer\\Messenger\\SendEmailMessage\" failed: Connection could not be established with host \"ssl://smtp.gmail.com:465\": stream_socket_client(): Unable to connect to ssl://smtp.gmail.com:465 (Connection refused) at /usr/www/users/[username]/[domain]/vendor/symfony/messenger/Middleware/HandleMessageMiddleware.php:80)\n[previous exception] [object] (Symfony\\Component\\Mailer\\Exception\\TransportException(code: 0): Connection could not be established with host \"ssl://smtp.gmail.com:465\": stream_socket_client(): Unable to connect to ssl://smtp.gmail.com:465 (Connection refused) at /usr/www/users/[username]/[domain]/vendor/symfony/mailer/Transport/Smtp/Stream/SocketStream.php:139)"} []

I have also try to use sendgrid+api like:
MAILER_DSN=sendgrid+api://API_KEY@default

with produce the error:

request.CRITICAL: Uncaught PHP Exception LogicException: "You cannot use "Symfony\Component\Mailer\Transport\AbstractHttpTransport" as the HttpClient component is not installed. Try running "composer require symfony/http-client"." at /usr/www/users/[username]/[domain]/vendor/symfony/mailer/Transport/AbstractHttpTransport.php line 36 {"exception":"[object] (LogicException(code: 0): You cannot use \"Symfony\\Component\\Mailer\\Transport\\AbstractHttpTransport\" as the HttpClient component is not installed. Try running \"composer require symfony/http-client\". at /usr/www/users/[username]/[domain]/vendor/symfony/mailer/Transport/AbstractHttpTransport.php:36)"} []

but the Http_Client (5.3.x) is installed via composer.

I have also try to clear the cache various times:
APP_ENV=prod APP_DEBUG=0 php bin/console clear:cache

and also delete the /var/cache directory directly on the terminal, nothing helps (always the same error).

I have also open a support ticket on sendgrid, but they have also no idea what's going wrong here. I'm also know that exists a bug in github (see #36224) but I couldn't believe that nobody have this problem in the past.

How i can use now the mailer now btw. how i can change the using port?