7 Best Resend Alternatives in 2026 (Prices Compared)

The best Resend alternative depends on why you’re leaving. Price, deliverability and surprise suspensions each have a good answer below.

The most common reason in 2026 is mail coming back. On Resend every received email counts against your quota like a send, threading is your code, and history is gone after 30 days.

The quick answer: if your mail comes back and needs an answer (an AI agent with its own address, a support inbox, replies to anything you send), use CarlyEmail. It gives you real inboxes with threads, received mail never touches your quota, and messages stay until you delete them. It’s free for 3 inboxes and 1,000 emails a month with your own domain and no card, then $20 a month for 25 inboxes. If you only send, Postmark is the deliverability pick, Plunk the open-source pay-per-email pick, Loops the pick when marketing is half your mail, and Amazon SES the price floor.

Prices were read from each vendor’s live pricing page or plan data on October 2, 2026, in USD, billed monthly.

Resend alternatives compared

“Official guide” means React Email’s own docs include a send guide for that provider.

Read the table honestly: for one-way sending, every sender on this list is cheaper per message than CarlyEmail, and Resend Pro’s 50,000 emails for $20 is hard to beat. CarlyEmail is priced per inbox because each address receives, stores and threads its conversations. If all you send is receipts, keep a sender. If mail has to come back and be answered, that’s what CarlyEmail is for, and plenty of teams run both.

Why developers leave Resend

• Received mail is metered like a send. Resend has received mail on every plan since late 2025, through an email.received webhook, and each inbound message counts as one email against the daily and monthly quota. On the free plan’s 100-a-day cap, a support agent that gets 60 emails a day can answer only 40 of them before replies fail with a 429.
• History is gone after 30 days. Email content, metadata and logs expire after 30 days on Free, Pro and Scale. An agent that needs last quarter’s thread needs your own database behind the webhook.
• Threading is your code, and Inboxes are still a beta. In the generally available API each received email is a standalone record, and you set In-Reply-To and grow References yourself. Resend’s Inboxes API (inbox objects, threads, labels, drafts) is in private beta. Developers have been filling the gap: a Hacker News commenter in May built a library that stores Resend’s inbound webhooks with thread information in your own database, calling it “a more complete package than what Resend themselves could provide”, and at least two inbox apps for reading and answering replies to Resend mail launched on Hacker News in August and September. Even Resend’s own Chat SDK adapter kept thread state in memory until a May bug report showed replies sent from a background worker losing their threading headers and landing in Gmail as new conversations (closed as fixed in August).
• Keys are all or send-only. A Resend key is either full access or send-only, optionally pinned to one domain. Reading inbound mail takes a full-access key, which reaches every domain on the team, so you can’t hand one agent a key to one inbox.
• Suspensions and suppressions you don’t see coming. Resend sits at 2.5 out of 5 on Trustpilot, and most 2026 reviews describe suspended accounts: one suspended the day after paying and kept from sending for 18 days, one suspended before the welcome email arrived, one banned a few days after moving a 100,000-contact list over. In February, Evan Mezeske, the developer of the Anukari audio plugin, wrote that Resend’s global suppression list (shared across all Resend accounts) was silently skipping license-key emails to ordinary Gmail addresses, and moved to Postmark.
• Monthly billing and a 10-domain ceiling. Self-serve plans bill monthly with no annual discount. Pro includes 10 domains, and more cost $20 a month per 100. A Trustpilot reviewer in June asked Resend to lift the limit for “many small websites with low email volume”, and a Hacker News commenter in April said they just want “to send some confirmation emails but I have to pay extra for each domain I add.”

Every Resend number is broken down in Resend pricing.

1. CarlyEmail

The Resend alternative for apps whose mail comes back. Resend starts from sending and added receiving as a webhook. CarlyEmail starts from the inbox: one API call creates a real address that receives, stores and threads mail, sends with SPF, DKIM and DMARC passing, and replies inside the conversation. Your React Email templates come with you, because every send takes html.

import { render } from "react-email";
import { CarlyEmail } from "carlyemail";
import { Receipt } from "./emails/receipt"; // the template you sent through Resend

const carly = new CarlyEmail(); // reads CARLYEMAIL_API_KEY
const inbox = await carly.inboxes.create({ username: "billing", domain: "mail.yourapp.com" });

// The part Resend did: send
await carly.messages.send(inbox.email, {
  to: ["claire@example.com"],
  subject: "Your receipt for order 1042",
  html: await render(<Receipt orderId="1042" />),
  text: "Order 1042 is confirmed. Reply here with any questions.",
});

// The part Resend left to you: read the reply and answer in-thread
const { messages } = await carly.messages.list(inbox.email, { labels: ["received"] });
await carly.messages.reply(inbox.email, messages[0].message_id, {
  text: "Thanks Claire, I've updated the billing address.",
});

In production you’d skip the polling: a signed message.received webhook fires the moment Claire’s reply lands, carrying its thread_id, so your handler or agent resumes the right conversation. The Python SDK has the same shape; see how to send email from Python.

• Received mail is free of your quota. Only sent recipients count. The free tier caps sending at 100 a day too, but an inbox that receives 60 emails still has all 100 sends. See receiving.
• Mail is kept until you delete it. There’s no 30-day clock. Messages stay within your plan’s storage: 1 GB free, 25 GB at $20, 250 GB at $200.
• Threads assembled for you, including the replies Outlook mangles. Reply to a message and In-Reply-To and References are set for you, and extracted_text gives you the new writing with the quoted chain stripped, which is what you hand a model. See threads.
• Keys scoped to one customer or one inbox. A key can reach the whole organization, one pod (one per customer), or a single inbox. An inbox-scoped key that asks for a sibling inbox gets inbox_out_of_scope, and another tenant’s mail returns 404. See authentication.
• Forged mail never reaches your handler. Mail failing SPF, DKIM or DMARC arrives as message.received.unauthenticated and spam as message.received.spam. Both are kept for inspection and neither fires message.received. See webhooks.
• Limits and suppressions you can read. A request that would cross a cap gets a 429 naming the cap, with an exact Retry-After. When a recipient hard-bounces or complains, the address goes on your organization’s own block list with the reason and the event that caused it, and the bounce and complaint rates that trigger an account review are published in the deliverability guide.
• Inboxes on every plan, free included, with your own domain and SPF, DKIM and DMARC set up for you (custom domains). No “sent via” footer on any plan.
• The developer experience Resend users expect. REST with an OpenAPI spec, TypeScript and Python SDKs, a CLI, and a hosted MCP server at https://api.carlyemail.com/mcp with 33 tools (MCP guide). Every error carries the fix and a docs link. Guides cover LangChain, the OpenAI Agents SDK, the Claude Agent SDK, the Vercel AI SDK, Mastra and Cloudflare Agents, and you keep your agent and your model key.

Sign-up is one API call, so an agent can do it itself. Paste this into any agent:

Read https://docs.carlyemail.com/llms.txt and set yourself up with an email address.

Until the owner confirms a 6-digit code, that account can only email its owner, which is what makes self-signup safe.

Pricing: Free is $0 with no card: 3 inboxes, 1,000 emails a month (100 a day), 1 custom domain and 1 GB of storage. Startup is $20 a month for 25 inboxes and 10,000 emails with no daily cap, 10 domains and 25 GB. Business is $200 a month for 250 inboxes, 100,000 emails, 100 domains and 250 GB. Enterprise covers higher volume, a dedicated sending domain or custom terms. Every plan gets the whole API, and cancelling drops you to free without deleting anything.

Best for: AI agents with their own addresses, support desks, per-customer inboxes, and any app where a reply has to land somewhere useful. The quickstart gets a first inbox running in a few minutes, and email APIs for AI agents walks through the builds. Get started with CarlyEmail.

2. Postmark

Where Anukari’s developer moved, and the usual pick when deliverability is the reason you’re leaving. Postmark, owned by ActiveCampaign, splits transactional and broadcast mail into separate message streams and keeps suppression lists per stream, readable and manageable through its API. React Email’s docs include a Postmark guide, and server tokens are scoped to one Postmark server, so each app or environment gets its own.

Best for: transactional mail where inbox placement matters more than price per message.

Pricing: Free is 100 emails a month and never expires. Basic is $15 for 10,000 ($1.80 per extra 1,000), $55 for 50,000 and $115 for 125,000. Pro starts at $16.50 and Platform at $18. Monthly billing only.

Limitations: inbound starts at Pro, and each processed inbound message counts as one email, the same metering you’re leaving. It arrives as a JSON webhook, so storing and threading conversations is still yours. Default retention is 45 days. At 50,000 emails a month it costs $55, against $20 on Resend Pro.

3. Loops

The answer to “Loops vs Resend” for SaaS teams that want onboarding, marketing and transactional email in one tool. Transactional emails are templates built in Loops’ editor (or uploaded as MJML) and sent through the API by ID with data variables, so someone who doesn’t write code can edit them. Transactional recipients don’t count as contacts, and paid plans have no cap on sends.

Loops vs Resend in one line: Resend is code-first, with templates in your repo as React components; Loops is editor-first, with templates in Loops and your code passing the variables. Pick Loops when a marketer owns the copy, and stay on Resend when developers own every email.

Best for: SaaS teams that want lifecycle sequences, newsletters and receipts in one place.

Pricing: Free is 4,000 emails per rolling 30 days with a “Powered by Loops” footer, for up to 1,000 subscribed contacts. Paid plans start at $49 a month, priced by subscribed contacts, with no cap on sends. Billed monthly.

Limitations: React Email templates don’t carry over. There’s no inbound email API, so replies go to whatever Reply-To address you set. A big contact list raises the price even if your transactional volume is small.

4. Plunk

The open-source pick, and the answer to “plunk email”: an AGPL email platform you can use hosted or run yourself, with transactional sends, campaigns and workflows behind one API. React Email’s docs include a Plunk guide. It also receives mail at your verified domain and stores a parsed copy.

Best for: indie developers who want pay-per-email pricing and the option to self-host.

Pricing: Free is 1,000 emails a month, with a Plunk footer on marketing emails. After that it’s $0.001 per email ($1 per 1,000) with no monthly fee, and emails with attachments cost two credits. A steady 50,000 a month comes to about $50, against $20 on Resend Pro.

Limitations: received mail counts against usage like a send, the same problem as Resend, and once a cap is hit inbound mail is dropped silently. Plunk doesn’t store attachments, the raw message or threading headers on inbound mail, and it adds each sender as a subscribed contact. A project has two keys: a public one for event tracking and a secret one for everything else.

5. SendGrid

Twilio’s email API, with keys you can scope endpoint by endpoint: Custom Access keys choose which parts of the API a key reaches and at what level. React Email’s docs include a SendGrid guide. It no longer has a free plan to stay on.

Best for: teams already on Twilio, or who want Marketing Campaigns in the same account.

Pricing: new accounts get a 60-day trial at 100 emails a day; the permanent free plans were retired in 2025. Essentials is $19.95 for 50,000 and $34.95 for 100,000. Pro, from $89.95 for 100,000, adds a dedicated IP, subusers and SSO. Monthly billing only. Detail in SendGrid pricing.

Limitations: Essentials keeps 3 days of email activity and Pro 7, both shorter than Resend’s 30. Inbound Parse posts each message to your URL and keeps nothing. SendGrid sits at 1.2 out of 5 on Trustpilot, with 2026 reviews about weekend suspensions and unanswered tickets. See SendGrid alternatives.

6. Mailgun

Sinch’s sender, and the fix for Resend’s 10-domain ceiling: Foundation includes 1,000 custom domains. Domain Sending Keys can only send for the one domain they were created on, much like Resend’s send-only keys, and Routes forward, store or parse inbound mail by rule. React Email’s docs include a Mailgun guide.

Best for: agencies and multi-brand apps sending from many domains, and teams that want routing rules.

Pricing: Free is 100 emails a day. Basic is $15 for 10,000. Foundation is $35 for 50,000 or $75 for 100,000. Scale starts at $90 for 100,000 with a dedicated IP included. Overage runs $1.80 to $0.40 per 1,000 by tier and can’t be switched off. Monthly billing only. Detail in Mailgun pricing.

Limitations: without a card on file, Free sends only from a sandbox domain to 5 authorized recipients. Free and Basic are single-user with one custom domain and one day of logs. Stored inbound messages last 1 to 7 days depending on plan. See Mailgun alternatives and SendGrid vs Mailgun.

7. Amazon SES

The price floor, and the hardest door to get through. Since July 21, 2026, new accounts start on the Essentials plan at $0.16 per 1,000 emails with no base fee, and accounts can switch to à la carte pricing at $0.10 per 1,000 outbound. IAM policies decide exactly what each credential can send, and React Email’s docs include an SES guide.

Best for: high-volume senders already on AWS with engineers to run the plumbing.

Pricing: 50,000 emails a month is about $8 on Essentials and 100,000 about $16. Pro is $105 a month plus $0.22 per 1,000. New AWS accounts get $100 in credits rather than a standing free tier. Detail in Amazon SES pricing.

Limitations: new accounts sit in a sandbox (200 emails a day, verified recipients only) until AWS grants production access, and a Hacker News commenter in April called that approval “next to impossible” now. Inbound lands as raw MIME in S3 or SNS, so parsing, threading, storage and bounce handling are yours.

Moving off Resend without losing mail

1. Save what you need first. Resend keeps email data for 30 days, so pull any received mail or logs you want before you cancel.
2. Keep your React Email templates. render() turns a template into an HTML string, and every provider above except Loops takes that string as the body.
3. Add the new provider’s DNS records next to Resend’s. Publish SPF and DKIM, cut sending over, and remove Resend’s records once queued mail drains. SPF allows 10 DNS lookups, so check the merged record. If Resend was receiving on your domain, the MX record moves too; a subdomain such as mail.yourapp.com keeps your company mailbox where it is.
4. Carry over bounces and complaints. Load addresses that hard-bounced or complained into the new provider’s suppression or block list before the first send.
5. Re-map webhooks. Event names differ everywhere. On CarlyEmail, arrival is message.received, with spoofed and spam mail on their own event types, so your handler only sees mail worth answering.

For the wider field, see the best email APIs, SendGrid alternatives and Cloudflare Email Service, which several Resend users on Hacker News said they’d try. For inbox APIs built for agents, see AgentMail alternatives. To stay on Resend and drive it from Claude or another assistant, see Resend MCP.

FAQ

What is the best Resend alternative?

It depends on why you’re leaving. If your app receives mail and has to answer it (AI agents, support, two-way), CarlyEmail gives you real inboxes with threads, and received mail doesn’t count against your quota. For one-way transactional mail, Postmark leads on deliverability, Plunk on open source and pay-per-email pricing, and Amazon SES on price per email.

Is there a free alternative to Resend?

Yes. CarlyEmail is free for 3 inboxes and 1,000 sent emails a month with a custom domain and no card, and received mail doesn’t count. Loops sends 4,000 emails per rolling 30 days with its footer, Plunk 1,000 a month (inbound included), Mailgun 100 a day and Postmark 100 a month. SendGrid has only a 60-day trial, and Amazon SES gives new AWS accounts credits instead of a free tier.

Loops vs Resend: which should I use?

Resend if developers own your emails as React components in the repo and you want the lower entry price ($20 for 50,000 emails). Loops if a marketer edits the copy and you want onboarding sequences and newsletters in the same tool; it’s priced by contacts from $49 a month with no cap on sends. Neither gives you threaded inboxes for replies.

Is Plunk a good Resend alternative?

For indie projects, yes. Plunk is open source (AGPL), self-hostable, free for 1,000 emails a month and $0.001 per email after that with no monthly fee, and React Email works with it. At steady volume it costs more than Resend Pro (about $50 versus $20 at 50,000 emails), and received mail counts against usage the same way.

Which Resend alternatives can receive email?

Most receive in some form. Postmark (from Pro), Plunk and Mailgun accept inbound mail, SendGrid posts it to a webhook and stores nothing, and Amazon SES writes raw MIME to S3. Postmark and Plunk count each received email against your volume. CarlyEmail stores and threads received mail until you delete it and never counts it against your quota. Loops doesn’t receive mail.

Can I keep using React Email if I leave Resend?

Yes. React Email is open source and render() produces a plain HTML string. React Email’s docs include send guides for Postmark, Plunk, SendGrid, Mailgun and Amazon SES, and CarlyEmail takes the same HTML in the html field of any send. Loops is the exception: its templates are built in its editor or uploaded as MJML.

Read https://docs.carlyemail.com/llms.txt and set yourself up with an email address.

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