Integrar sendgrid a ojs2

hola sabran cuales son los pasos para poder integrar sendgrid a ojs2
ya hice varias pruebas pero no logro que se puedan mandar correos
smtp = On
smtp_server = smtp.sendgrid.net
smtp_port = 587
smtp_auth = tls
smtp_username = apikey
smtp_password = PASSWORD (es la key)
allow_envelope_sender = On
default_envelope_sender = info@MYDOMAIN (correo que se coloco en sendgrid)
force_default_envelope_sender = On
force_dmarc_compliant_from = On
dmarc_compliant_from_displayname = ‘%n’
time_between_emails = 3600
max_recipients = 10
require_validation = Off
validation_timeout = 14