Startup

.env.prod

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+### Compiled or real environment variables should be used in production.
+### Configure MAILER_DSN to use SendGrid API transport.
+### Prefer storing SENDGRID_API_KEY using Symfony Secrets or real env vars.
+
+###> symfony/mailer ###
+# Example using SendGrid API key (replace with real secret via vault/secrets):
+# SENDGRID_API_KEY=SG.xxxxx
+MAILER_DSN=sendgrid+api://%env(resolve:SENDGRID_API_KEY)%@default
+###< symfony/mailer ###