Resend has Audiences made up of Contacts. You can send Broadcasts to your Audiences. When adding a Contact, you can assign it an email address and first and last name to personalize your Broadcast to them. You can add your Contacts to an Audience in three different ways: via API, CSV upload, or manually.

​
1. Adding Contacts programmatically via API

You can add contacts to an Audience programmatically. For instance, after someone makes a purchase, you can add them to your “Paying Customers” audience. Resend’s SDKs have support for the contacts endpoint. 
import { Resend } from 'resend';

const resend = new Resend('re_xxxxxxxxx');

resend.contacts.create({
email: 'steve.wozniak@gmail.com',
firstName: 'Steve',
lastName: 'Wozniak',
unsubscribed: false,
audienceId: '78261eea-8f8b-4381-83c6-79fa7120f1cf',
});

​
2. Adding Contacts by uploading a .csv

1

Go to Audiences

Go to the Audiences page, and select Add Contacts.Adding Contacts
2

Select Import

Select Import CSV.
3

Upload CSV

Upload your CSV file from your computer.Adding Contacts
4

Map Fields

After uploading your CSV file, you’re able to map the fields you want to use. Currently, the supported mapping fields are email, first_name, last_name, and unsubscribed.Import Contacts via CSVFinally, select Continue, review the contacts, and finish the upload.

​
3. Adding Contacts manually

1

Go to Audiences

Go to the Audiences page, and select Add Contacts.Adding Contacts
2

Choose Manual

Select Add Manually.
3

Add Contacts

You can then add either one, or multiple email addresses into the text field, separating multiple email addresses with commas.Adding Contacts Manually