Email Bump
Start For Free Join With Google
Comparison

The best AgentMail alternatives

AgentMail sells inboxes to AI agents: create one over the API, receive mail, thread it, answer it. It's a clean idea and the SDKs are good. What people run into is the unit it charges for — inboxes — and the fact that the mailbox is where it stops.

Alternatives below, with what each costs and what it can't do. We make one of them. It's marked, and we say plainly where AgentMail is ahead: they have IMAP, and we don't.

7 options Prices checked 4 August 2026 No affiliate links
The short answer

Pick by the reason you're leaving

Nobody replaces a platform in the abstract. Something specific stopped working. Start from that, not from a feature matrix.

No inbox limit at allEmail Bump

Catch-all addressing: every address at your domain already works, so there is nothing to create and nothing to count.

Best for a shared human mailboxAgentMail

IMAP, so an agent and a person can work the same inbox from a normal mail client.

Best inbound parsing pedigreePostmark

Inbound has been a first-class product there for years, with a parsed JSON payload people trust.

Most flexible routingMailgun

Routes match on pattern and can forward, store or POST — useful when the mailbox is a pipeline stage.

Context

Why people look for an AgentMail alternative

Not because it does the job badly. Because of what it charges for, and where it ends.

You pay per inbox, and agents want a lot of them 3 inboxes free, 10 on the $20 plan, 150 on the $200 plan. That is fine for a handful of long-lived agents and awkward the moment you want an address per customer, per ticket, or per run — which is the usual reason for wanting programmatic inboxes in the first place. Every new address is a provisioning call that can fail, and a number on an invoice.

The mailbox is the whole product An agent that answers support mail eventually needs to know who it is talking to, whether they have been emailed before, and whether they ever unsubscribed. AgentMail holds the thread; it does not hold the person. Contacts, lists, consent state and lifecycle email are a second vendor.

Deliverability is your problem once volume arrives Custom domains with DKIM, SPF and DMARC are there, which is the right foundation. What isn't is the layer above it — suppression on bounce and complaint, branded tracking links, per-domain reputation reporting — the things that decide whether an agent's mail keeps arriving after the first thousand.

It is a young company holding your conversations Agent inboxes are a new category and AgentMail is one of the newest names in it. That is not a criticism of the product; it is a reason some teams want their agent's mail sitting somewhere that also does the boring, older parts of email and is paid for by more than one use case.

The baseline

AgentMail's published pricing

Everything below is compared against these numbers, read on 4 August 2026.

Plans

What it costs

$0/mo
3 inboxes · 3,000 emailsFree
$20/mo
10 inboxes · 10,000 emailsDeveloper
$200/mo
150 inboxes · 150,000 emailsStartup
Custom
Up to unlimited inboxesEnterprise
What you get

Included on every plan

  • Inbox creation over the API
  • Threaded send, receive and reply
  • Webhooks and WebSockets
  • Custom domains with DKIM, SPF and DMARC
  • Python and TypeScript SDKs
  • An MCP server
  • IMAP and SMTP access
  • Multi-tenant Pods for platform builders
Side by side

All 7, on the things that decide it

ProviderStarts atFree tierMarketing emailLicenceData region
Email BumpHosted$19/mo at 10,000 contacts5,000 contacts and 5,000 emails a monthIncluded — campaigns, flows, segments and the API share one billProprietaryUnited States (Amazon SES, us-east-1)
PostmarkHosted$15/mo for 10,000 emails (Basic)100 emails a monthBroadcast streams only — 15 on Basic, 30 on Pro, unlimited on Platform. No visual automation builder.ProprietaryUnited States
MailgunHosted$15/mo for 10,000 emails (Basic)100 emails a day, with 1-day log retentionSold separately as Mailgun Optimize / Mailjet rather than bundledProprietaryUnited States or European Union, per account
ResendHosted$20/mo for 50,000 emails (Pro); marketing contacts are a second plan from $40/mo3,000 emails a month capped at 100 a day, 1 domain — plus a separate 1,000-contact marketing free planBroadcasts, on a separate contact-priced plan. No journey builder.ProprietaryUnited States
SendGridHostedEssentials from $19.95/moNone any more — a 60-day trial at 100 emails a dayMarketing Campaigns is a separate product with its own contact-based pricingProprietaryUnited States, with EU options on enterprise agreements
MailtrapHosted$15/mo for 10,000 emails (Basic)4,000 emails a month, capped at 150 a day, 3 days of logsBulk stream on Business and above; no journey builderProprietaryUnited States, with EU sending available
Amazon SESHosted$0.16 per 1,000 emails (Essentials, first 10M/mo)Up to $200 in AWS free-tier credits for new accounts, over the first 6 monthsNone. SES is a sending pipe.ProprietaryYour choice of AWS region, including several in the EU

Read off each vendor's own pricing or documentation page on 2 August 2026. Where a vendor renders prices from a slider and publishes no static table, the cell says so instead of repeating a number from someone's affiliate post.

In detail

Every option, and what it's bad at

01Hosted service

Email Bump

Best for: Teams paying twice — once for the transactional API, again for the newsletter

Marketing and transactional email in one product, billed on contacts rather than sends. The transactional API takes the same field names most developer email APIs use, so the migration is a base URL and a key. Also the only one on this list with a first-class CLI and MCP server, so an agent can run the whole account without a browser.

Starts at
$19/mo at 10,000 contacts
Free tier
5,000 contacts and 5,000 emails a month
Marketing
Included — campaigns, flows, segments and the API share one bill
Data region
United States (Amazon SES, us-east-1)
What it does well
  • One price covers campaigns, automated flows, segments and the transactional API.
  • Sending is uncapped on paid plans under fair use — a viral week doesn't produce an overage bill.
  • Unsubscribed and bounced contacts stop counting, so the bill tracks your real audience.
  • Unlimited team seats and unlimited sending domains on every plan, including free.
  • CLI, MCP server and agent skills cover the same surface as the API, including creating the account itself.
  • Inbound email, SMTP on the same key, and webhooks are part of the plan, not upsells.
What to watch for
  • Sending is US-only today — there is no EU data region.
  • Not open source, and there's no self-hosted build.
  • The free plan puts a 'Powered by Email Bump' badge on marketing footers. Transactional sends never carry it.
  • Younger than Postmark or SendGrid, without their decade-plus of public deliverability history.
02Hosted service

Postmark

Best for: Transactional mail where a receipt arriving late is a support ticket

The long-standing deliverability specialist. Separate message streams keep transactional and broadcast reputation apart, retention goes to a year, and support answers with an engineer rather than a bot.

Starts at
$15/mo for 10,000 emails (Basic)
Free tier
100 emails a month
Marketing
Broadcast streams only — 15 on Basic, 30 on Pro, unlimited on Platform. No visual automation builder.
Data region
United States
What it does well
  • Deliverability track record is the longest of anything on this list.
  • Retention is customisable up to 365 days on Pro and Platform, against Resend's flat 30 days.
  • Inbound email processing on Pro and above.
  • Support is a genuine differentiator, not a plan checkbox.
What to watch for
  • Overage is $1.80 per 1,000 on Basic — twice Resend's $0.90 — so bursts get expensive.
  • Broadcasts are a stream, not a marketing tool: no segments, no journeys.
  • Dedicated IPs start at $50/mo per IP.
03Hosted service

Mailgun

Best for: Teams that need an EU sending region from a large, established vendor

A veteran developer email API, now part of Sinch. US or EU sending from one account, plus validation and deliverability services sold alongside.

Starts at
$15/mo for 10,000 emails (Basic)
Free tier
100 emails a day, with 1-day log retention
Marketing
Sold separately as Mailgun Optimize / Mailjet rather than bundled
Data region
United States or European Union, per account
What it does well
  • EU region on an established platform with real support contracts.
  • Scale at $90/mo for 100,000 emails includes a dedicated IP.
  • Email validation and deliverability tooling available as add-ons.
What to watch for
  • Log retention is 1 day on Free and Basic, 5 days on Foundation — painful when debugging.
  • $1.80 per 1,000 overage on Basic.
  • Extra dedicated IPs are $59 each per month.
04Hosted service

Resend

Best for: Developer experience, and an official SDK in whatever you write in

The current default recommendation for developer email. Thirteen official SDKs, a CLI, a clean dashboard, and react-email — the open-source library that made writing email in React tolerable. Transactional volume and marketing contacts are billed as two separate plans.

Starts at
$20/mo for 50,000 emails (Pro); marketing contacts are a second plan from $40/mo
Free tier
3,000 emails a month capped at 100 a day, 1 domain — plus a separate 1,000-contact marketing free plan
Marketing
Broadcasts, on a separate contact-priced plan. No journey builder.
Data region
United States
What it does well
  • Official SDKs for 13 languages plus a CLI — the widest first-party coverage here.
  • react-email is open source, genuinely good, and portable to any provider.
  • Inbound receiving, SMTP and webhooks are all first-class.
  • $0.90 per extra 1,000 emails is half Postmark's Basic overage rate.
What to watch for
  • Transactional volume and marketing contacts are billed as two separate subscriptions.
  • 30-day data retention on every plan, including Scale.
  • Overage is charged automatically per extra 1,000 emails against the card on file.
  • No EU region, and sending domains are capped by plan: 1 on Free, 10 on Pro.
05Hosted service

SendGrid

Best for: Enterprise volume, and procurement teams who want Twilio on the contract

The incumbent. Owned by Twilio, sold alongside their messaging products, and built for scale most senders never reach. The free plan is gone — what's left is a 60-day trial at 100 emails a day.

Starts at
Essentials from $19.95/mo
Free tier
None any more — a 60-day trial at 100 emails a day
Marketing
Marketing Campaigns is a separate product with its own contact-based pricing
Data region
United States, with EU options on enterprise agreements
What it does well
  • Scale and reliability at volumes most of this list never sees.
  • Part of Twilio, so SMS and voice sit on the same contract.
  • Extensive SDK coverage and a very large body of existing integrations.
  • Enterprise procurement, SLAs and compliance paperwork are all in place.
What to watch for
  • The permanent free tier was replaced by a 60-day trial — a real change if you last looked a while ago.
  • Marketing Campaigns is priced separately from the Email API, so a product with a newsletter pays twice.
  • Higher-tier prices aren't published as a static table.
  • Support quality is the most consistent complaint in this category.
06Hosted service

Mailtrap

Best for: Teams who want the test sandbox and production sending from one vendor

Best known for its email-testing sandbox, which catches staging mail before it reaches a real inbox. The sending product grew out of that and keeps the same debugging bias.

Starts at
$15/mo for 10,000 emails (Basic)
Free tier
4,000 emails a month, capped at 150 a day, 3 days of logs
Marketing
Bulk stream on Business and above; no journey builder
Data region
United States, with EU sending available
What it does well
  • The staging sandbox has no real equivalent at Resend.
  • Free tier is 4,000 emails/month against Resend's 3,000.
  • Bounce categorisation and per-domain debugging are unusually good.
What to watch for
  • Log retention is short on cheaper plans: 3 days free, 5 days on Basic.
  • Dedicated IP and bulk stream only arrive on Business, which starts at $85/mo.
  • Two products in one console takes a minute to get used to.
07Hosted service

Amazon SES

Best for: High volume where you already have engineers to own the plumbing

The wholesale layer most of this list resells. Nothing is cheaper per email, and nothing asks more of you: no dashboard worth the name, no templates, no contact model, no suppression UI beyond the basics.

Starts at
$0.16 per 1,000 emails (Essentials, first 10M/mo)
Free tier
Up to $200 in AWS free-tier credits for new accounts, over the first 6 months
Marketing
None. SES is a sending pipe.
Data region
Your choice of AWS region, including several in the EU
What it does well
  • $0.16 per 1,000 is roughly a fortieth of Resend's Pro rate at the same volume.
  • Regions everywhere, so data residency is a config value.
  • Scales past anything a SaaS plan will sell you.
What to watch for
  • You build the dashboard, the templates, the retries, the suppression list and the reporting.
  • New accounts start in a sandbox; production access and quota increases are reviewed.
  • Attachments are billed separately at $0.12/GB, and deliverability tooling costs extra.
The honest part

One thing AgentMail has that we do not

**IMAP.** You can point a mail client, or anything that speaks IMAP, at an AgentMail inbox. We have no IMAP at all: mail is read over the REST API, a WebSocket, the CLI, an MCP tool, or the dashboard. If your requirement is "an agent and a human share the same mailbox in Apple Mail", we are the wrong answer, and saying otherwise would waste your afternoon.

They also ship first-party Python and TypeScript SDKs. We publish a REST API, a CLI, an MCP server and a set of agent skills, which covers the same ground for an agent and less ground for a human writing application code by hand.

The structural difference

We do not have inboxes, so we cannot run out of them

Every project gets a catch-all receiving domain the moment it exists — `[email protected]`. Not a wildcard you configure: there is no inbox object, so `ticket-4471@…`, `agent-a9f2@…` and `invoices@…` all already work, right now, without a call and without a limit.

That changes what you can build. An address per support ticket costs nothing and needs no provisioning step that might fail halfway. An address per customer is free. An address per agent run, thrown away afterwards, is free. On a per-inbox plan each of those is a line item and a quota to watch.

Point an MX record at us and the same is true of your own domain, so the address your customers see is yours rather than a subdomain of ours.

After the mailbox

The part that isn't an inbox

An agent that reads and answers mail is halfway to a support desk. The other half is the person on the other end: their history, their consent, whether the last three emails bounced.

That is the same product here rather than a second vendor. The address that received the message belongs to a project that also holds contacts, lists and segments; the reply is logged next to every campaign and automated flow that contact has ever been sent; an unsubscribe on any of it suppresses all of it. When the agent's job grows from answering to following up — a sequence after a demo, a nudge when a trial goes quiet — it is a flow, not an integration.

FAQ

AgentMail alternatives, asked and answered

Can Email Bump give an AI agent its own email address?

Yes, and there is nothing to create. Every project receives on a catch-all domain, so `[email protected]` works immediately — no API call, no inbox object, no limit on how many you use. Point an MX record at us to do the same on your own domain.

Can an agent reply to email, not just read it?

Yes. `POST /v1/inbound/{id}/reply` answers inside the thread the sender already has open — In-Reply-To, References and the Re: prefix are set for you, so it lands in the conversation rather than beside it. Reply-To points back at the receiving address, so their next message returns to the same mailbox.

How many inboxes do I get?

The question does not apply. There is no inbox object to allocate, so the number of addresses you receive on is not metered or capped. Plans are priced by contacts, which is a different axis entirely — an agent mailbox with no marketing list attached sits on the free tier.

Does Email Bump have WebSockets?

No. Delivery of a received message is an `email.received` webhook — a POST to a URL you host, usually within a second. AgentMail has both webhooks and WebSockets, and if you need a persistent connection they are the better fit.

Can I read the mailbox over IMAP?

No. Mail is read over the REST API, a WebSocket, the CLI, an MCP tool, or the dashboard. AgentMail supports IMAP; we do not, and if a human needs the same mailbox open in a normal mail client that is a real reason to choose them.

What happens to threading?

It is preserved on both sides. Received messages keep their Message-ID, In-Reply-To and References, and replies sent through the API carry the chain forward — verified against a third-party mail service, which filed the reply into the original thread.

Give an agent a mailbox

Every address already works

Sign up without a browser, get a catch-all receiving domain, and have an agent reading and replying in a few minutes. Free while you are small.

Start free Read the API docs

Keep reading

Email Bump vs AgentMailThe head-to-head, including where AgentMail is the better buy.Every comparisonAll the platforms we've priced and compared, in one index.Email Bump pricingWhat contact-based pricing costs at every list size.