GREG-390: Handle 550 error
Unhandled 550 errors that occur when sending email to an invalid email cause the task to retry indefinitely, creating a lot of noise in Sentry. We now handle these errors so that the task stops, and log a warning instead.
Unhandled 550 errors that occur when sending email to an invalid email cause the task to retry indefinitely, creating a lot of noise in Sentry. We now handle these errors so that the task stops, and log a warning instead.