Resend free tier alternative that receives email
Resend is a great free tier for sending. But it can't receive. Here's a full-duplex alternative — send and receive free — and when to just use Resend.
Resend has one of the nicest free tiers in transactional email — clean API, good docs, generous send volume. But like every sending API, it stops at send. The moment you need to receive — a reply, a verification code, an inbound message — you need something else. If that’s you, here’s a full-duplex alternative.
The actual gap: receiving
Resend sends. It doesn’t give you an inbox. So it can’t:
- Read a reply to a message you sent.
- Pull an OTP code from an email (for testing or an agent).
- Accept inbound mail your app should process.
That’s not a knock on Resend — it’s a different product category. If your need is one-way sending, Resend’s free tier is a fine answer and you can stop reading.
A full-duplex free tier
If you need to receive, a mailbox API sends and receives on the free tier:
# send (like Resend)
curl -X POST https://login.ollastack.com/api/mailboxes/mbx_.../send \
-H "Authorization: Bearer $TOKEN" -H "Content-Type: application/json" \
-d '{"to":"user@example.com","subject":"Hi","text":"Hello"}'
# receive — the part Resend can't do
curl "https://login.ollastack.com/api/mailboxes/mbx_.../wait?timeout=60" \
-H "Authorization: Bearer $TOKEN"
# → { "subject":"Re: Hi", "codes":["920184"], "links":["..."] }
Honest comparison
| Resend (free tier) | Ollastack (free tier) | |
|---|---|---|
| Transactional send | ✅ generous volume | ✅ modest volume |
| Receive / real inbox | — | ✅ |
| Read OTP codes & links | — | ✅ |
| Disposable test inboxes | — | ✅ |
| High-volume one-way sending | ✅ | use a transactional sender |
The honest split: Resend wins on send volume; Ollastack wins on receiving, testing, and two-way flows. Many teams use both.
When to use which
- Only sending, at volume → Resend (or another transactional sender).
- Need to receive, test, or hold two-way conversations → the full-duplex API.
See the email API overview and best email API.
Try the full-duplex free tier — send and receive, no card.
Frequently asked questions
What's a Resend free tier alternative that receives email?
Ollastack offers a free tier that sends AND receives — each mailbox has a real receiving address, so you can read replies, OTP codes, and inbound mail over HTTP. Resend is a sending API and doesn't provide inboxes.
Is Resend bad?
Not at all — Resend is an excellent transactional sending API with a developer-friendly free tier. If you only need to send, it's a great choice. The gap is receiving: it doesn't give you an inbox to read mail back from.
Should I use both?
Often yes. Use Resend (or any transactional sender) for high-volume one-way sending, and a full-duplex API for the receive side — inbound mail, replies, OTP verification, and CI testing.
Does the alternative need a credit card?
No. The free tier sends and receives with no credit card.
Last updated June 21, 2026. Spotted something out of date? Email hello@ollastack.com.