emails.send

The mail your own code decides to send, with no journey and no rule behind it.

const { deliveryId } = await cow.emails.send({
  to: "[email protected]",
  template: { key: "receipt", props: { orderId: "A-2291" } },
});

Or write the message inline:

await cow.emails.send({
  to: "[email protected]",
  subject: "Your receipt",
  html: "<p>Thanks for your order.</p>",
});

Field	Required	Notes
to	yes	One address or a list, up to 50. cc, bcc and replyTo take the same.
template	either	{ key, props }: a template you pushed, and the props it declares. It writes the whole message.
subject + html / text	either	An inline message. Refused beside a template.
from	yes	An address on a domain your organization verified. There is no other.
headers	no	Passed on as you wrote them.
sourceId	on the wire	The client’s, unless the call names one.

The promise resolves once the message has been handed over, and deliveryId is the row in Deliveries that records what happened to it.

What is checked

Your credit, then your suppression list, then the from-address. An address that has bounced or complained is dropped from the message; if that leaves nobody, the call still answers with an id and the delivery records that it was suppressed.

Only a transactional template can be sent this way. A marketing template is refused, because a direct send carries no consent purpose, so there is nothing to check an unsubscribe against. Send those from a journey.

Already sending with Resend?

Point the Resend SDK at Cowliss and keep the code you have. See Resend SDK.