--- title: "Best inbound email parsing services in 2026" description: "Inbound email parsing services ranked: the parsed message and its verdicts, how deliveries are signed and retried, and receiving on the free plan." url: https://www.unitpost.com/best/inbound-email-parsing section: Roundups updated: 2026-11-02 --- # Best inbound email parsing services in 2026 For apps that receive email and want it as JSON, Unitpost ranks first: receiving on the free plan, signed webhooks retried for about 19 hours, and the message with its SPF, DKIM and DMARC verdicts through the API. Postmark and CloudMailin send the richest parsed payloads, CloudMailin has the largest free volume, and AgentMail suits AI agents with their own inboxes. > Updated 2026-11-02. We make Unitpost, and it is on this list. Every score has a reason and the weights are published below, so you can re-rank it for your own needs. ## At a glance | # | Product | Best for | Free plan | Score | | --- | --- | --- | --- | --- | | 1 | Unitpost | apps that send and receive on one domain | 5,000 emails a month, 200 a day, no card | 4.7 | | 2 | AgentMail | AI agents with their own inboxes | 3 inboxes, 3,000 emails a month, 100 a day | 4.1 | | 3 | CloudMailin | parsing only, at a large free volume | 10,000 inbound emails a month, up to 512 KB each | 4.0 | | 4 | Resend | developers already sending with Resend | 3,000 emails a month, 100 a day | 4.0 | | 5 | Mailgun | routing rules on many addresses | 100 emails a day on one domain | 3.7 | | 6 | MailerSend | small projects sending with MailerSend | 500 emails a month, card required | 3.7 | | 7 | Postmark | the richest parsed payload | 100 emails a month | 3.4 | | 8 | SendGrid | teams already on Twilio SendGrid | None: a 60-day trial at 100 emails a day | 3.4 | ## How inbound parsing works everywhere - Point an MX record for a subdomain (such as in.example.com) at the service, so your main domain's mail is untouched - The service receives each message and posts it, or a notice of it, to your webhook - Verify the signature, dedupe on the event id, answer 2xx at once, and do the work in the background - Treat the content as untrusted input, above all if a model reads it ## 1. Unitpost Best for apps that send and receive on one domain. Receiving on your verified domain on every plan, a signed email.received webhook, and the message, headers and SPF, DKIM and DMARC verdicts through the API. Pros: - Receiving on the free plan - Signed webhooks retried for about 19 hours - Replies thread with in_reply_to Cons: - The webhook carries metadata; the body comes from the API - No spam score in the payload Free plan: 5,000 emails a month, 200 a day, no card. Paid from: $10 a month for 20,000 emails. Priced by: emails sent. Website: https://www.unitpost.com ## 2. AgentMail Best for AI agents with their own inboxes. Inboxes for agents, with text and the new reply extracted, spam and prompt-injection verdicts, and delivery by webhook or WebSocket. Pros: - Reply text extracted from quoted history - WebSockets, no public endpoint needed - Prompt-injection scanning Cons: - No custom domains on the free plan - Built for agents' mailboxes, not app mail Free plan: 3 inboxes, 3,000 emails a month, 100 a day. Paid from: $20 a month for 10 inboxes. Priced by: inboxes and sends. Website: https://www.agentmail.to ## 3. CloudMailin Best for parsing only, at a large free volume. An inbound-only service: normalized JSON with text, HTML, reply text and attachments, and 10,000 emails a month free. Pros: - 10,000 emails a month free, no card - Normalized JSON or the raw message - Attachments inline or in your own storage Cons: - It doesn't retry; the sending server does - 512 KB per message on the free plan Free plan: 10,000 inbound emails a month, up to 512 KB each. Paid from: $25 a month (Starter). Priced by: emails sent. Website: https://www.cloudmailin.com ## 4. Resend Best for developers already sending with Resend. Inbound on every plan with a Svix-signed webhook; the body, headers and raw MIME come from the API. Pros: - Inbound on the free plan - Svix-signed, retried for about a day Cons: - Each received email counts toward the sending quota - No spam verdicts documented Free plan: 3,000 emails a month, 100 a day. Paid from: $20 a month for 50,000 emails. Priced by: sends and contacts. Website: https://resend.com ## 5. Mailgun Best for routing rules on many addresses. Routes that match recipients and forward to a URL as form data, JSON or raw MIME, signed with HMAC. Pros: - JSON, form or raw MIME - Stripped reply text - HMAC-signed Cons: - One route on Free, five on Basic - Spam headers are off by default Free plan: 100 emails a day on one domain. Paid from: $15 a month for 10,000 emails. Priced by: emails sent. Website: https://www.mailgun.com ## 6. MailerSend Best for small projects sending with MailerSend. Inbound routing on every plan, forwarding parsed JSON with SPF and DKIM checks to a webhook or an address. Pros: - Inbound routing on the free plan - HMAC-signed webhooks Cons: - A forward counts as a sent email - No spam score Free plan: 500 emails a month, card required. Paid from: $7 a month for 5,000 emails. Priced by: emails sent. Website: https://www.mailersend.com ## 7. Postmark Best for the richest parsed payload. Parsed JSON with text, HTML, the stripped reply and attachments inline, plus SpamAssassin headers, on Pro and Platform. Pros: - Attachments inline, up to 35 MB - Stripped reply text - Raw MIME on request Cons: - Not on Basic or the free plan - Basic auth instead of a signature Free plan: 100 emails a month. Paid from: $15 a month for 10,000 emails. Priced by: emails sent. Website: https://postmarkapp.com ## 8. SendGrid Best for teams already on Twilio SendGrid. Inbound Parse posts multipart data with text, HTML, SPF, DKIM and an optional spam score, signed with ECDSA. Pros: - Up to 30 MB a message - ECDSA-signed - Retried for up to 3 days Cons: - Multipart, not JSON - The free option is a 60-day trial Free plan: None: a 60-day trial at 100 emails a day. Paid from: $19.95 a month (Essentials). Priced by: sends and contacts. Website: https://www.twilio.com/en-us/sendgrid ## Scores | Product | Parsed message (35%) | Delivery to you (35%) | Inbound on free (30%) | Total | | --- | --- | --- | --- | --- | | Unitpost | 4 | 5 | 5 | 4.7 | | AgentMail | 4 | 5 | 3 | 4.1 | | CloudMailin | 5 | 2 | 5 | 4.0 | | Resend | 3 | 5 | 4 | 4.0 | | Mailgun | 4 | 4 | 3 | 3.7 | | MailerSend | 3 | 4 | 4 | 3.7 | | Postmark | 5 | 3 | 2 | 3.4 | | SendGrid | 4 | 4 | 2 | 3.4 | ## How we scored This list is for developers who receive email in an app: support replies, reply-by-email, forwarded receipts, or an AI agent's inbox. What matters is the parsed message, deliveries you can trust and retry, and what receiving costs. - **Parsed message (35%).** Text, HTML, headers, attachments and authentication or spam verdicts as JSON, with the raw MIME available. - **Delivery to you (35%).** Signed webhook deliveries, retried for hours when your endpoint is down. - **Inbound on free (30%).** Receiving included on a free plan, on your own domain. Each product gets 1 to 5 per criterion; the total is the weighted mean. ### Why Unitpost scored 4.7 - Parsed message: 4/5. Text, HTML, headers and SPF, DKIM and DMARC verdicts through the API, raw MIME on a signed link; the webhook carries metadata only. - Delivery to you: 5/5. Signed (svix-compatible) and retried 8 times over about 19 hours. - Inbound on free: 5/5. Receiving on the free plan, on your verified domain. Checked 2026-11-02 against https://www.unitpost.com/pricing, https://www.unitpost.com/sms, https://registry.npmjs.org/unitpost. ### Why AgentMail scored 4.1 - Parsed message: 4/5. Text, HTML and the new reply text extracted, attachments through the API, raw message by link; spam and prompt-injection verdicts. - Delivery to you: 5/5. Svix-signed, with 8 attempts over about a day, or WebSockets. - Inbound on free: 3/5. On the free plan, with 3 inboxes but no custom domains. Checked 2026-11-02 against https://www.agentmail.to/pricing, https://docs.agentmail.to/integrations/mcp, https://docs.agentmail.to/imap-smtp, https://docs.agentmail.to/idempotency.md, https://docs.agentmail.to/llms.txt, https://docs.agentmail.to/overview. ### Why CloudMailin scored 4.0 - Parsed message: 5/5. Normalized JSON with plain text, HTML, reply text, headers, envelope SPF and base64 attachments, or the raw message. - Delivery to you: 2/5. A custom Authorization header; it doesn't retry itself, a 5xx makes the sending server retry. - Inbound on free: 5/5. 10,000 emails a month free, no card, up to 512 KB each. Checked 2026-11-02 against https://www.cloudmailin.com/plans, https://docs.cloudmailin.com/http_post_formats/json_normalized/, https://docs.cloudmailin.com/receiving_email/http_status_codes/, https://docs.cloudmailin.com/receiving_email/securing_your_email_url_target/. ### Why Resend scored 4.0 - Parsed message: 3/5. Webhook metadata only; text, HTML, headers and raw MIME through the API, with no spam verdicts documented. - Delivery to you: 5/5. Svix-signed, with 8 attempts over about a day. - Inbound on free: 4/5. On every plan, free included; each received email counts toward the quota. Checked 2026-11-02 against https://resend.com/pricing, https://resend.com/migrate, https://resend.com/docs/dashboard/receiving/introduction, https://github.com/resend/mcp-send-email, https://resend.com/docs/send-with-smtp, https://resend.com/docs/api-reference/api-keys/create-api-key, https://registry.npmjs.org/resend, https://resend.com/docs/dashboard/webhooks/retries-and-replays. ### Why Mailgun scored 3.7 - Parsed message: 4/5. Form or JSON with the body, stripped reply text and headers, or raw MIME; spam headers when switched on. - Delivery to you: 4/5. HMAC-signed, retried for up to 8 hours. - Inbound on free: 3/5. One inbound route on Free, five on Basic, all routes from Foundation. Checked 2026-11-02 against https://www.mailgun.com/pricing/, https://www.mailgun.com/resources/guides/migrating-from-sendgrid-to-mailgun-email-api/, https://documentation.mailgun.com/docs/mailgun/mcp, https://documentation.mailgun.com/docs/mailgun/user-manual/sending-messages/send-smtp, https://registry.npmjs.org/mailgun.js, https://documentation.mailgun.com/docs/mailgun/user-manual/receive-forward-store/receive-http. ### Why MailerSend scored 3.7 - Parsed message: 3/5. JSON with text, HTML, headers, raw MIME and SPF and DKIM checks; no spam score. - Delivery to you: 4/5. HMAC-signed, with webhook retries for up to about 3 days. - Inbound on free: 4/5. Inbound routing on every plan, free included; a forward counts as a sent email. Checked 2026-11-02 against https://www.mailersend.com/pricing, https://developers.mailersend.com/mcp, https://www.mailersend.com/help/smtp-relay, https://www.mailersend.com/features/inbound-emails, https://developers.mailersend.com/api/v1/webhooks.html, https://registry.npmjs.org/mailersend, https://developers.mailersend.com/api/v1/inbound. ### Why Postmark scored 3.4 - Parsed message: 5/5. JSON with text, HTML, the stripped reply, headers and attachments inline, raw MIME optional, SpamAssassin headers. - Delivery to you: 3/5. Basic auth in the URL rather than a signature; 10 retries from 1 minute to 6 hours. - Inbound on free: 2/5. Inbound processing on Pro and Platform, not Basic or the free plan. Checked 2026-11-02 against https://postmarkapp.com/pricing, https://postmarkapp.com/migration-guides, https://postmarkapp.com/lp/mcp, https://postmarkapp.com/developer/user-guide/send-email-with-smtp, https://registry.npmjs.org/postmark, https://postmarkapp.com/developer/webhooks/inbound-webhook. ### Why SendGrid scored 3.4 - Parsed message: 4/5. Multipart with text, HTML, headers, SPF, DKIM and an optional spam score; raw MIME optional; up to 30 MB. - Delivery to you: 4/5. ECDSA-signed or OAuth; 5xx responses retried for up to 3 days. - Inbound on free: 2/5. Inbound Parse on every plan, but the free option is a 60-day trial. Checked 2026-11-02 against https://www.twilio.com/en-us/products/email-api/pricing, https://www.twilio.com/docs/sendgrid/for-developers/sending-email/integrating-with-the-smtp-api, https://www.twilio.com/docs/sendgrid/ui/analytics-and-reporting/email-activity-feed, https://registry.npmjs.org/@sendgrid/mail, https://www.twilio.com/docs/sendgrid/for-developers/parsing-email/inbound-email. ## FAQ ### What is inbound email parsing? Receiving email at an address you control and turning each message into structured data (sender, subject, text, HTML, attachments, verdicts) that a service posts to your app, instead of storing it in a mailbox. ### Should the webhook carry the whole message? Either works. A full payload saves a request; metadata with a fetch keeps large attachments off your endpoint and lets you read the message only when you need it. Either way, verify the signature before you read anything. ## Related - [Best email APIs for AI agents in 2026](https://www.unitpost.com/best/email-apis-for-ai-agents): Email APIs ranked for AI agents: official MCP servers, send safety, reading replies, agent-readable docs and the free plan. With the reasons for every score. - [Best newsletter tools for SaaS product updates in 2026](https://www.unitpost.com/best/newsletter-tools-for-saas): Newsletter tools ranked for SaaS teams emailing their own users: syncing with your app, pricing as signups grow, the editor, and transactional mail too. - [Best SMTP relay services in 2026](https://www.unitpost.com/best/smtp-relay-services): SMTP relay services ranked for apps and self-hosted tools: ports and TLS, scoped credentials, the free plan, deliverability, logs and the first paid step.