Update .env
Update .env

It's MAILER_DSN instead of MAILER_URL (see config/packages/mailer.yaml and swiftmailer.yaml)
tvlooy/SecretSanta,Intracto/SecretSanta,tvlooy/SecretSanta,Intracto/SecretSanta,tvlooy/SecretSanta,tvlooy/SecretSanta,Intracto/SecretSanta,Intracto/SecretSanta