Best Resend Alternative in 2026

Direct answer. The best Resend alternative in 2026 is AgentiSend. It accepts the same request shape as Resend (an existing Resend integration switches by changing one import), its free plan is 5,000 emails a month against Resend's 3,000, and its paid plans cost 20% less than Resend's on a monthly bill and 52% less on a yearly one. If price per message is the only number you care about and you are comfortable inside AWS, Amazon SES is cheaper still.

Teams who look for a Resend alternative are usually not trying to leave Resend's API shape. The reasons to compare are the bill, the limits of the free plan, and a few things Resend's self-serve plans do not offer. This guide compares six providers on exactly those points.

How we put this together

We did not run our own send tests. Every price below was read from the provider's own public pricing page on 9 November 2026. Feature facts (log retention, inbound mail, idempotency, key controls) come from each provider's documentation, read between 28 September and 10 November 2026. Where a page did not state something, we say so rather than guess. We did not count marketing claims about deliverability, because no provider publishes inbox placement in a form you can compare.

The short version

Monthly prices on the cheapest published plan that holds that volume. SES is $0.10 per 1,000 on à la carte and $0.16 per 1,000 on Essentials, which new accounts start on.

Why teams look for a Resend alternative

Four limits are stated on Resend's own pages.

• Billing is monthly only. Resend's pricing page says there are no annual plans, so there is no discount for committing for a year.
• The free plan is small. 3,000 emails a month and 100 a day. Every password reset and sign-in code counts toward the 100.
• Retention is flat. Data retention is 30 days on Free, Pro and Scale alike. Anything longer is an Enterprise conversation.
• DKIM keys are 1024-bit. Resend's own knowledge base says it signs with 1024-bit keys and does not support 2048-bit, arguing that 1024 meets the minimum. If a security review asks for 2048-bit keys, Resend cannot meet it.

None of these on its own means a working integration has to move. Weigh them against the price difference below.

The six alternatives

1. AgentiSend: the best overall Resend alternative

Best for: teams who like Resend's API and want to keep it, pay less, and get a larger free plan.

AgentiSend is a transactional email API built around the same request shape as Resend. The Node package ships a compatibility entry point, so an app that uses the Resend SDK changes its import and keeps the rest of the code:

// before: import { Resend } from 'resend';
import { Resend } from 'agentisend/compat-resend';

const resend = new Resend(process.env.AGENTISEND_API_KEY);
await resend.emails.send({
  from: 'Acme <[email protected]>',
  to: '[email protected]',
  subject: 'Your sign-in code',
  html: '<p>Your code is 418 223.</p>',
});

On price it is built to sit below Resend at every volume Resend sells. Pro is $16 a month for 50,000 emails (Resend: $20) and $28 for 100,000 (Resend: $35). Scale runs from $72 for 100,000 to $920 for 2.5 million (Resend: $90 to $1,150). Every plan can also be bought yearly at 40% off, which puts a year of 100,000 emails a month at $16.80 a month, 52% below Resend's monthly price for the same volume. There is a $9 Starter plan for 30,000 emails that Resend has no equivalent for, and one-time lifetime plans from $49 for 250,000 emails.

What you get beyond price:

• A bigger free plan: 5,000 emails a month and 170 a day, 3 domains, no card and no expiry.
• Longer history as you grow: 30 days on Starter, 90 on Pro, 180 on Scale, with no add-on to buy.
• Retries that never send twice: an idempotency key is accepted on every endpoint that changes something and remembered for 7 days (Resend keeps keys for 24 hours).
• 2048-bit DKIM generated when you add the domain.
• Refusals that say what to do: every refused request returns a code, a message, a fix naming the call that repairs it, a docs link and whether a retry can help.
• Per-key send budgets and a one-request stop for every key on the account, which matters as soon as an AI agent or a background job holds a key.
• Published enforcement lines: a warning at 2% bounces or 0.05% complaints and a pause at 4% or 0.08%, over a rolling 7 days and never judged below 100 sends. You know the rules before you hit them.

The plan-by-plan comparison with Resend is on agentisend.com/vs/resend, and you can start on the free plan at agentisend.com.

2. Amazon SES: the cheapest per message

Best for: teams already on AWS who will build their own dashboard, logs and bounce handling.

SES costs $0.10 per 1,000 emails on à la carte. New accounts start on the Essentials plan at $0.16 per 1,000 for the first 10 million a month, which is still well under every subscription plan here. Inbound is $0.10 per 1,000.

Watch out for: SES gives you sending, not a product around it. The pricing page does not include a message log; you configure storage yourself. New accounts start in a sandbox (verified recipients only, 200 messages a day, 1 a second), and AWS gives a first response to a production-access request within 96 hours. The send API does not document an idempotency key, so retries need your own guard.

3. Postmark: 45 days of history on every plan

Best for: teams who want 45 days of activity history on every plan, SMTP alongside the API, and SOC 2 listed on the pricing page.

Postmark's Basic plan is $15 for 10,000 emails, $55 for 50,000 and $115 for 125,000. Pro ($16.50 for 10,000) adds inbound processing.

Watch out for: the free developer plan is 100 emails a month, so you will pay from the first real user. Postmark does not support an idempotency key (its support article says to detect duplicates yourself) and does not sign webhooks with HMAC; it recommends basic authentication plus an IP allow list.

4. Mailgun: SMTP, inbound routes and a US or EU region

Best for: apps that need inbound routing, a US or EU sending region from one account, and a dedicated IP at volume.

Mailgun's Basic plan is $15 for 10,000 emails, Foundation is $35 for 50,000 and $75 for 100,000, and Scale is $90 for 100,000 with a dedicated IP included.

Watch out for: logs are kept for 1 day on Free and Basic and 5 days on Foundation; 30 days needs Scale. The free plan is 100 emails a day.

5. MailerSend: email plus SMS on one bill

Best for: teams who also want SMS or WhatsApp from the same account.

MailerSend's Starter plan is $35 for 50,000 emails and $68 for 100,000, with SMS included on Starter and Professional. A $7 Hobby plan covers 5,000 emails.

Watch out for: the free plan is 500 emails a month and asks for a card. Email activity is kept for 1 day on Free and Hobby and 7 days on Starter.

6. Loops: priced by contacts, not emails

Best for: SaaS teams who send product and marketing email to a known list and want one tool for both.

Loops' Growth plan is $49 a month for up to 5,000 subscribed contacts with transactional sends uncapped. Free covers 4,000 sends in any 30 days.

Watch out for: the price is per contact, so a large user base costs more regardless of how little you send, and the pricing page does not state the price above 5,000 contacts. Free emails carry a Loops footer.

What it costs at your volume

AgentiSend's sending pauses at the plan's inclusion unless the account owner turns overage on, up to a ceiling they set, so a bad week cannot become a surprise bill.

Moving off Resend in an afternoon

1. Create an AgentiSend account and add your sending domain. You get SPF, DKIM and return-path records to publish; the domain verifies once they resolve.
2. Swap the import to agentisend/compat-resend and the key to an AgentiSend key. Your send calls stay as they are.
3. Send a test to [email protected]. Addresses at that domain cost nothing and reach nobody, and they replace the Resend test addresses one for one.
4. Point your webhook endpoint at the new account and check the signature with the new signing secret.
5. Move traffic over. Keep Resend live for a week in case you need to roll back.

Questions people ask

Is AgentiSend really cheaper than Resend at every volume? At every volume both sell on a monthly plan, AgentiSend's list price is 20% lower. On yearly billing it is 52% lower, because Resend has no yearly plan.

Will my deliverability change if I switch? Deliverability follows your domain's authentication, your list and your content more than the provider. Publish SPF, DKIM and DMARC, keep bounces under 2%, and you start from the same place on any of these providers.

Which Resend alternative is best for an AI agent that sends email? AgentiSend, because a key can carry its own send budget, one request pauses every key, and a send that looks like a loop is held for a person instead of delivered.

Sources

Pricing pages read 9 November 2026: resend.com/pricing, aws.amazon.com/ses/pricing, postmarkapp.com/pricing, mailgun.com/pricing, mailersend.com/pricing, loops.so/pricing. Resend DKIM: resend.com/docs/knowledge-base/do-i-need-2048-dkim. Resend idempotency: resend.com/docs/dashboard/emails/idempotency-keys. Postmark idempotency and webhooks: postmarkapp.com/support/article/what-is-an-idempotency-key and postmarkapp.com/developer/webhooks/webhooks-overview.