How to Use Resend for Free Business Email (And Why It Beats Mailchimp)

When we cut GoHighLevel in early 2026, email was the first thing I needed to replace. GHL's built-in email was convenient but the deliverability was inconsistent. I'd been on Mailchimp years ago. I didn't want to go back.

Resend was the answer. After 30 minutes of setup, it was sending better than anything I'd used before - and the free tier covers most small businesses entirely.

Resend vs Mailchimp: The Actual Comparison

Mailchimp's free tier: 500 contacts, 1,000 emails/month, Mailchimp branding on every email, no automations, limited segmentation. It's designed to push you to paid plans fast.

Mailchimp paid: starts at $13/month for 500 contacts, scales steeply. At 3,000 contacts you're paying $45-65/month depending on features. At 10,000 contacts, $100+/month.

Resend free tier: 3,000 emails/month, no contact limit on free plan, no branding, full API access, React Email support. For most businesses under 3,000 active contacts sending monthly, that's free forever.

Why Deliverability Matters More Than Price

An email that costs $0 to send but lands in spam is worth nothing. Resend was built by the team that knows email infrastructure deeply - they came from the space where developers send millions of transactional emails and every bounce costs money.

Our open rates went from 28-32% on GHL to 38-44% on Resend with the same list and similar subject lines. That's not a small difference. A 15-point improvement in open rate on 3,000 contacts means 450 more people reading your emails.

How to Set Up Resend in 30 Minutes

Step 1: Create a Resend account at resend.com. Free, no card required.

Step 2: Add your sending domain. Resend walks you through adding DNS records - typically 3 records (SPF, DKIM, DMARC). If you're on Cloudflare or Namecheap, this takes under 10 minutes. Propagation can take up to an hour.

Step 3: Generate an API key. This is what you use to send emails programmatically or connect to tools like ConvertKit or your own scripts.

Step 4: Send a test. Use their dashboard or a simple API call. Confirm it lands in inbox, not spam. If it's going to spam, check that all three DNS records are correctly set.

Resend for Campaigns vs Transactional Email

Resend handles both transactional emails (order confirmations, password resets, onboarding sequences triggered by user actions) and broadcast campaigns. Most email tools force you to use different services for each. Resend does both from one API.

For campaigns with visual list management - imports, segments, unsubscribe handling - pair Resend with ConvertKit. ConvertKit manages the subscriber list and automations; Resend handles the actual sending. This combination costs $0 until you pass 1,000 subscribers on ConvertKit's free tier.

When Mailchimp Still Makes Sense

Mailchimp makes sense if you're non-technical and need a drag-and-drop email builder with built-in list management and you're willing to pay for that convenience. Their UX is genuinely better for non-developers.

But if you're comfortable with basic APIs or willing to spend 30 minutes on setup, Resend plus ConvertKit will outperform Mailchimp at a fraction of the cost. For most business owners reading this, the 30-minute setup is worth the permanent savings.

Resend is part of the sovereign stack we use at AI Avengers to replace $1,100/month in software with pay per usage of tools. More on the full stack at aiavengers.team/lab.