Oct 2, 2026

8 Best SendGrid Alternatives in 2026 (Prices Compared)

SendGrid has no free plan anymore, its cheapest tier is $19.95 a month, and support is the complaint people repeat most when they leave.

The right replacement depends on one question: does your mail only go out, or does it come back and need an answer?

The quick answer: if replies matter (an AI agent with its own inbox, a support desk, anything two-way), use CarlyEmail. It gives you real inboxes with threads, signed arrival webhooks and in-thread replies, free for 3 inboxes and 1,000 emails a month with no card. If you only send receipts and password resets, Postmark is the deliverability pick, Resend the developer-experience pick, and Amazon SES the cheapest per email.

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

SendGrid alternatives compared

	Best for	Free tier	Paid from	When mail comes back
CarlyEmail	Agents, support, two-way apps	3 inboxes, 1,000 emails/mo, custom domain, no card	$20/mo: 25 inboxes, 10K emails	Real inboxes and threads, kept until you delete them, never counted against your quota
Postmark	Transactional deliverability	100 emails/mo	$15/mo: 10K emails	JSON webhook from Pro ($16.50); each inbound email counts toward volume
Resend	Developer experience	3,000/mo, 100/day	$20/mo: 50K emails	Webhook on every plan; counts against quota; 30-day retention
Mailgun	Routing rules at volume	100/day	$15/mo: 10K emails	Routes; messages kept 1 day (Foundation) or up to 7 (Scale)
Amazon SES	Lowest cost per email	None (sandbox until approved)	$0.16 per 1,000, no base fee	Raw MIME to S3 or SNS; you build the rest
Brevo	Transactional and marketing in one account	300/day	$9/mo: 5,000 emails	Inbound parsing webhook
Mailtrap	Testing plus sending	4,000/mo, 150/day	$15/mo: 10K emails	Inbound and agent inboxes; shares quota with sending
Bird (formerly SparkPost)	Cheap flat-rate volume	1,000/mo, 50/day	$15/mo: 50K emails	Inbound webhook; 30-day retention
SendGrid, for reference		60-day trial, 100/day	$19.95/mo: 50K emails	Inbound Parse webhook; nothing stored

Read the table honestly: for one-way sending at volume, every transactional sender here is cheaper per message than CarlyEmail. CarlyEmail is priced per inbox because each address receives, stores and threads its conversations. If all you send is receipts, buy a sender. If mail has to come back and be answered, that’s what CarlyEmail is for. Plenty of teams run both.

Why people leave SendGrid in 2026

The free plan is gone. New accounts since March 25, 2025 get a 60-day trial at 100 emails a day, and Twilio began retiring existing free plans on May 27, 2025. One Hacker News commenter called the $19.95 floor “totally overkill for low traffic projects”; another moved a personal site’s contact form to Resend “without too much work.” Full numbers in SendGrid pricing.
Support and sudden blocks. SendGrid sits at 1.2 out of 5 on Trustpilot, and the 2026 reviews repeat each other: a Saturday suspension that took over a day to lift and deleted the queued backlog, a trial that ended in manual onboarding while production mail stopped, a ticket unanswered after nine days, and a hijacked account billed $16,406.54 for the attacker’s sends. In June, a Hacker News commenter whose team sends 60,000 emails a day described a four-day account block with no reply to calls, email, chat or tickets, fixed “within minutes” once they rang enterprise sales.
A reputation score you can’t trust. Font Awesome wrote in March 2026 that it held a 99% reputation score inside SendGrid while its mail was quietly landing in Gmail spam. A former customer on Hacker News described the same gap (98% inside SendGrid, tanking at Gmail and Microsoft) and said rebuilding on a new provider took over a year.
Shared IPs. Essentials sends from a shared IP pool, so other senders’ behavior is part of your reputation. In January 2026 Fred Benenson documented a run of phishing sent through compromised SendGrid customer accounts, passing SPF and DKIM.
It only sends. Inbound Parse POSTs each message to your URL and keeps nothing: no inbox, no threads, and a message is dropped if your endpoint stays down for 72 hours. That’s fine for a contact form and a sprint of plumbing for anything that has to answer.

1. CarlyEmail

The SendGrid alternative for apps whose mail comes back. SendGrid, and most of this list, is built to push mail out. CarlyEmail starts from the inbox: one API call creates a real address that receives, stores and threads mail, so an AI agent or a support tool can read the conversation and reply inside it.

import { CarlyEmail } from "carlyemail";

const carly = new CarlyEmail();
const inbox = await carly.inboxes.create({ username: "support" });

// The part SendGrid did: send
await carly.messages.send(inbox.email, {
  to: ["claire@example.com"],
  subject: "Your order shipped",
  text: "It's on the way. Reply here with any questions.",
});

// The part SendGrid left to you: hear the reply
await carly.webhooks.create({
  url: "https://yourapp.com/hooks/carlyemail",
  event_types: ["message.received"],
});

When Claire writes back, carly.messages.reply(inbox.email, messageId, { text: "On it." }) answers in the same thread in her mail client.

Inboxes, not a parse webhook. Mail is stored, parsed and threaded on arrival, including the replies Outlook mangles, and stays until you delete it. See receiving and threads.
Received mail is free of your quota. Only sent recipients count. On Resend, Postmark and Mailtrap, every inbound email counts against the same allowance as your sends.
Signed events that resume the right conversation. Webhooks and WebSockets fire the moment mail lands, carrying a thread_id. Mail failing SPF, DKIM or DMARC arrives as message.received.unauthenticated and spam as message.received.spam, so a forged sender never reaches your message.received handler. See webhooks and email to webhook.
Limits you can read. A request that would cross a cap gets a 429 naming the cap, with an exact Retry-After. The bounce and complaint rates that trigger an account review are published in the deliverability guide, suppression of bounced and complained addresses is automatic, and no tracking pixels or rewritten links are added to your mail.
Guardrails in the key. A key with draft_create but not message_send gets a 403 on send however the agent reasons, so a person approves before anything goes out.
Pods for multi-tenant apps. One pod per customer, keys scoped to a pod or a single inbox, so Josh’s tenant can’t read Emily’s mail. See pods.
Your own domain on every plan, free included, with SPF, DKIM and DMARC set up for you (custom domains). No “sent via” footer on any plan.
Works with your stack. REST, TypeScript and Python SDKs, a CLI, and a hosted MCP server at https://api.carlyemail.com/mcp with 33 tools (MCP guide). Guides cover LangChain, the OpenAI Agents SDK, the Claude Agent SDK, the Vercel AI SDK, Mastra and Cloudflare Agents. You keep your agent and your model key.

Sign-up is one 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 why self-signup is safe.

Pricing: Free is $0 for 3 inboxes and 1,000 emails a month (100 a day). Startup is $20 a month for 25 inboxes and 10,000 emails with no daily cap. Business is $200 a month for 250 inboxes and 100,000 emails. 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 maps the build patterns. Get started with CarlyEmail.

2. Postmark

The deliverability reputation pick, now part of ActiveCampaign. Postmark separates transactional and broadcast mail into different streams so a newsletter can’t drag down your password resets, and it’s the name former SendGrid users on Hacker News keep recommending for inbox placement.

Best for: transactional mail where landing in the inbox matters more than the price per message.

Pricing: Free is 100 emails a month and doesn’t expire. Basic is $15 for 10,000 emails ($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; dedicated IPs from $50 a month, for senders at 300,000 a month or more.

Limitations: inbound processing starts at Pro, not Basic, and each processed inbound message counts as one email toward your volume. Inbound arrives as a JSON webhook; storing and threading conversations is yours to build. The free tier is a test allowance.

3. Resend

The developer favorite: a clean API, React Email for templates, and a free tier that survived where SendGrid’s didn’t. Resend now receives mail on every plan through an email.received webhook, and has an Inboxes API in private beta.

Best for: developers who want the nicest API and docs for transactional sending.

Pricing: Free is 3,000 emails a month, capped at 100 a day. Pro is $20 for 50,000 and $35 for 100,000. Scale runs from $90 for 100,000 to $1,150 for 2.5 million. Dedicated IP $30 a month on Scale. Monthly only. Detail in Resend pricing.

Limitations: each received email counts against the daily and monthly quota like a send, so on Free an agent that receives 60 emails in a day can only send 40. Data is kept 30 days. Reading inbound needs a full-access key. More options in Resend alternatives.

4. Mailgun

Sinch’s sender, and SendGrid’s closest like-for-like at volume: comparable tiers, dedicated IPs, and Routes for forwarding, storing or parsing inbound mail by rule.

Best for: teams sending hundreds of thousands to millions a month who want routing rules and add-on deliverability tools.

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. 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. Head-to-head in SendGrid vs Mailgun.

5. Amazon SES

The cost floor. Since July 21, 2026, new accounts start on SES’s 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.

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

Pricing: 100,000 emails a month costs about $16 on Essentials. Pro is $105 a month plus $0.22 per 1,000. Dedicated IPs are $24.95 each per month. New AWS accounts get $100 in credits rather than a standing free tier. Detail in Amazon SES pricing.

Limitations: new accounts start in a sandbox (200 emails a day, verified recipients only) until AWS approves production access. Inbound arrives as raw MIME in S3 or SNS, so parsing, threading, storage and bounce handling are yours to build.

6. Brevo

Formerly Sendinblue: a marketing platform with a transactional API and SMTP relay on every plan, including free. Its free plan sends 300 emails a day, which is why it keeps coming up in threads about SendGrid’s free-tier retirement.

Best for: small teams that want transactional and marketing email in one account.

Pricing: Free is 300 emails a day with no card. Starter is from $9 a month for 5,000 emails, Standard from $18, and Professional from $499 (from 150,000 emails). Yearly billing saves 10%. A dedicated IP is an add-on billed annually.

Limitations: the product and pricing are built around marketing campaigns and contacts, so a pure transactional sender pays for features it won’t use. Inbound is a parsing webhook rather than stored inboxes.

7. Mailtrap

Started as an email testing sandbox and now sells sending, marketing and inbound, including agent inboxes that group replies into conversations.

Best for: teams that want test environments and production sending under one vendor.

Pricing: Free is 4,000 emails a month (150 a day). Basic is $15 for 10,000, $20 for 50,000 or $30 for 100,000. Business, which adds a dedicated IP and 100 domains, runs $85 for 100,000 to $450 for 750,000. Extra emails cost $1.00 per 1,000 on Basic and $0.88 on Business.

Limitations: the daily and monthly quotas are shared between sending and receiving. Free and Basic have no dedicated IP and keep logs for 3 and 5 days.

8. Bird (formerly SparkPost)

SparkPost now sells as Bird’s Email API, at some of the lowest flat monthly prices on this list, with inbound email that fetches bodies and attachments by reference.

Best for: volume senders who want a cheap flat plan from a long-running sending infrastructure.

Pricing: Free is 1,000 emails a month (50 a day). Startup is $15 for 50,000 or $30 for 100,000. Growth runs $80 for 100,000 to $1,039 for 2.5 million. Overage is $0.90 per 1,000 on Startup and Growth. Dedicated IPs are $24.95 a month each on Growth, up to five.

Limitations: overage costs three times Startup’s included rate, and sends pause at 5 times the plan by default. Data retention is 30 days. Matching inbound replies to conversations is left to your app.

Moving off SendGrid without losing mail

Export your suppression lists (bounces, spam reports, unsubscribes) and load them into the new provider’s block or suppression list before the first send. Mailing someone who already complained is the fastest way to hurt a new sender’s reputation.
Add the new provider’s SPF and DKIM records next to SendGrid’s, cut sending over, and remove SendGrid’s records once the last queued mail has drained. SPF allows 10 DNS lookups, so check the merged record.
Warm up a new domain. Start with tens to hundreds of messages a day and grow over a couple of weeks.
Repoint Inbound Parse. Change the MX record on your parse domain. If you were parsing replies so a person or an agent could answer them, that handler is what CarlyEmail replaces with stored, threaded inboxes.
Re-map event webhooks. Every provider names delivery, bounce and open events differently.

For the rest of the field, see the best email APIs and Mailgun alternatives. To stay on SendGrid and drive it from Claude or another assistant, see SendGrid MCP.

FAQ

What is the best SendGrid alternative?

It depends on what your mail does. For apps whose mail comes back and needs an answer (AI agents, support, two-way), CarlyEmail gives you real inboxes with threads and signed webhooks. For one-way transactional mail, Postmark leads on deliverability, Resend on developer experience, and Amazon SES on price per email.

Is there a free alternative to SendGrid?

Yes, several, and unlike SendGrid’s 60-day trial they don’t expire. CarlyEmail is free for 3 inboxes and 1,000 emails a month with a custom domain. Resend’s free tier is 3,000 emails a month (100 a day), Mailtrap’s 4,000 a month (150 a day), Brevo’s 300 a day, Bird’s 1,000 a month and Mailgun’s 100 a day.

What is the cheapest SendGrid alternative?

Amazon SES, at $0.16 per 1,000 emails on its default Essentials plan (about $16 for 100,000) or $0.10 per 1,000 on à la carte pricing. Among flat plans, Bird and Mailtrap both charge $30 a month for 100,000 emails, against $34.95 on SendGrid Essentials.

Which SendGrid alternatives can receive email?

All of them receive in some form, but most hand you a webhook and leave storage and threading to you. Postmark processes inbound from its Pro plan, and Resend, Postmark and Mailtrap count each inbound email against your quota. CarlyEmail stores and threads received mail until you delete it and doesn’t count it against your quota.

Can I use SendGrid and CarlyEmail together?

Yes, and it’s a common split: keep SendGrid or another sender for bulk receipts, and give the addresses that need to talk back (a support inbox, an agent’s address) to CarlyEmail. Each works on its own domain or subdomain.

Give your agent a real inbox

Your agent gets its own email address. People can email it, it answers in the same thread, and your personal inbox stays out of it. Start with 3 inboxes, no card needed.

Get started

See the prompt

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