Resend API: sending email, domains and events with AI agents
Resend is an email sending service built for developers, with a simple REST API and SDKs. It is used for transactional email, such as confirmations and notifications, and also for announcements. Access is through an API key created in the dashboard, after you verify the sending domain.
What the Resend API offers
Sending email
Send messages in HTML or text, with attachments, sender and reply-to configured.
Batch sending
Send several messages in a single call.
Domains
Register and verify sending domains with DNS records.
Audiences and contacts
Manage contact lists for announcements.
Webhooks
Receive events such as delivered, opened, bounced and marked as spam.
API keys
Create and revoke keys with full access or send-only permission.
How to access the Resend API
- Public APIAn API key generated in the Resend dashboard and sent in the authorization header. You can restrict the key to sending and to one domain.
- Use a key with send-only permission for the agents.
- Respect plan limits and good practices so you do not hurt the domain's reputation.
- Marketing announcements require a list with consent and an unsubscribe option.
Official documentation: resend.com/docs
What an iTeam agent does with the Resend API
Service confirmations
After resolving a ticket, the agent sends an email with the summary and next steps, using the company's domain.
Proposals and follow-ups
The sales agent emails the approved proposal and uses the events to see whether it was delivered and opened.
Operational alerts
The operations agent emails suppliers when an order is late, with the history kept in the audit trail.
List cleanup
Using bounce and spam events, the agent marks invalid contacts in the CRM so nobody keeps mailing them.
From the credential to the agent at work, with approval
Verify the domain
In Resend, register the sending domain and publish the DNS records it lists.
Restricted key in the vault
Create a send-only key and store it in the iTeam vault, defining which agents can send email and to whom.
Cap and approval
Set a daily sending cap and, at the start, approval for emails to customers, with an audit of every message.
Ready-made AI teams for this work
WhatsApp customer service
Customers write at 11 p.m. and on Sundays. This team replies in seconds, with your prices and policies, and calls a person when it should.
Help desk support team
It reads each ticket, finds the answer in your docs and past replies, and drafts a response your agents can send or improve.
AI phone receptionist
It answers the phone, books the visit in your calendar and sends your team a short note about every call.
Online store support team
It looks up the real order in Shopify or WooCommerce and answers tracking, return and exchange questions in seconds.
Customer success team
It reads usage, tickets and CRM notes every week and tells your team which accounts need a call, and why.
Customer feedback analysis
It reads every comment, finds the themes behind the scores and tells each area what customers are asking it to fix.
Questions about the Resend API
Is the Resend API free?
Resend has a free plan with a sending limit and paid plans for larger volumes. The limits change over time, so check Resend's pricing page.
Do I need to code to use the Resend API with iTeam?
Not necessarily. iTeam's HTTP tool reads the API documentation and learns the endpoints, and the deployment team sets up credentials, permissions and tests with you.
Is Resend good for email marketing?
It focuses on transactional email, but it also has audience and announcement features. For large campaigns, review the limits and the consent rules.
