Schedule and Bulk Email with Audiences

Beyond one-off transactional mail, eSMS Mail supports audiences and scheduling for campaigns.

Audiences

Under Audiences, create a contact list and upload a CSV. You can then compose to the whole list.

Scheduling

Any send can be scheduled by passing send_at (ISO 8601, at least a minute in the future, up to 30 days out):

{ "from": {...}, "to": [...], "subject": "...", "html": "...",
  "send_at": "2026-08-01T09:00:00Z" }

Scheduled emails appear under Scheduled and dispatch automatically at the time you set.

Personalise

Combine audiences with templates to personalise each message with the recipient's data.