Example tasks
Send a sequence of emails using Resend
This example will show you how to send a sequence of emails over several days using Resend with Trigger.dev.
Overview
Each email is wrapped in retry.onThrow. This will retry the block of code if an error is thrown. This is useful when you don’t want to retry the whole task, but just a part of it. The entire task will use the default retrying, so can also retry.
Additionally this task uses wait.for to wait for a certain amount of time before sending the next email. During the waiting time, the task will be paused and will not consume any resources.
Task code
trigger/email-sequence.ts
import { Resend } from "resend";
const resend = new Resend(process.env.RESEND_ASP_KEY);
export const emailSequence = task({
id: "email-sequence",
run: async (payload: { userId: string; email: string; name: string }) => {
console.log(`Start email sequence for user ${payload.userId}`, payload);
// Send the first email immediately
const firstEmailResult = await retry.onThrow(
async ({ attempt }) => {
const { data, error } = await resend.emails.send({
from: "[email protected]",
to: payload.email,
subject: "Welcome to Trigger.dev",
html: `<p>Hello ${payload.name},</p><p>Welcome to Trigger.dev</p>`,
});
if (error) {
// Throwing an error will trigger a retry of this block
throw error;
}
return data;
},
{ maxAttempts: 3 }
);
// Then wait 3 days
await wait.for({ days: 3 });
// Send the second email
const secondEmailResult = await retry.onThrow(
async ({ attempt }) => {
const { data, error } = await resend.emails.send({
from: "[email protected]",
to: payload.email,
subject: "Some tips for you",
html: `<p>Hello ${payload.name},</p><p>Here are some tips for you…</p>`,
});
if (error) {
// Throwing an error will trigger a retry of this block
throw error;
}
return data;
},
{ maxAttempts: 3 }
);
//etc...
},
});
Testing your task
To test this task in the dashboard, you can use the following payload:
{
"userId": "123",
"email": "<your-test-email>", // Replace with your test email
"name": "Alice Testington"
}
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