I use sparkpost mail to send email.
tested with CURL can send email successfully.
but with discourse, always get this error:
Sent mail to MYEMAIL@gmail.com (695.6ms)
Job exception: 500 5.5.2 unrecognized command
Sent mail to MYEMAIL@gmail.com (684.1ms)
Job exception: 500 5.5.2 unrecognized command
I’ve already set app.yml SiteSetting.notification_email options.
how can I fix it?