Notification delivery
Customer channels & preferences
Plan each email or SMS independently from the automation rule, customer contact details and customer preferences.
HTML DEV simulation: this decides what would be queued. It does not contact an email or SMS provider.
Delivery rules
Operational messages, reminders, waitlist alerts and review requests can have different customer preferences. Missing contact details suppress only the unavailable channel.
Why separate jobs?
Email and SMS are separate delivery jobs so one provider can retry without duplicating a successful message on another channel.