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Pidgeon vs SendGrid
SendGrid hands you received mail once, as a webhook, and the rest is yours to build. Pidgeon keeps it. Here is when each is the right call.
The short version
SendGrid is one of the longest-running email APIs there is, and it is very good at the job it was built for: sending large volumes of mail from an application and getting it delivered. It can receive too — its Inbound Parse webhook posts each incoming message to a URL you run.
That is where the two part ways. SendGrid hands you received mail once, as a webhook, and the rest is yours to build. Pidgeon keeps it. Every Pidgeon address is a mailbox that stores, threads and searches its mail, opens in a mail client, and lets a person take a conversation over from the agent.
Choose SendGrid if your agent mostly sends and you need dedicated IPs, marketing campaigns or an established vendor on the procurement list. Choose Pidgeon if your agent has to read replies and answer in the same thread.
At a glance
Prices and limits as published on 17 October 2026. SendGrid prices in US dollars, Pidgeon in euros.
| Pidgeon | SendGrid | |
|---|---|---|
| Free | A free plan: 3 mailboxes, 1 custom domain | A 60-day trial at 100 emails a day; sending stops when it ends |
| First paid plan | €20 a month: 10 mailboxes, 10,000 sent a month | From $19.95 a month: 50,000 emails, shared IP |
| Getting started | Sign up, or let your agent sign itself up | Email confirmation, domain authentication, two-factor and a payment method |
| Received mail | Stored in a mailbox, threaded, searchable | Posted to your webhook; storing it is up to you |
| Threads and replies | Built in | Not provided |
| IMAP for mail clients | Every plan, with an app password | Not offered; SMTP is for sending |
| Hand-off between agent and human | Thread owner and assignment events | Not provided |
| Mail that tries to steer the agent | Firewall verdict on every inbound message | A spam score on messages up to 2.5 MB |
| MCP server | Hosted and npm | No official server; a tutorial for building one |
| Dedicated IPs | No | From the Pro plan, $89.95 a month |
| EU data residency | No | Pro and Premier, through an EU subuser |
Where Pidgeon is different
Received mail has somewhere to live
Inbound Parse posts each message to your URL as form data or raw MIME, retries for up to three days if your server is down, and then the message is gone from SendGrid's side. Twilio's own tutorial for an AI email agent stores incoming mail in the developer's S3 bucket. With Pidgeon that store is the product: every message is kept, threaded and searchable through the API, and GET /v1/messages/await returns the next one with any verification code already pulled out.
Conversations, not deliveries
A reply your agent sends from Pidgeon lands in the same thread as the message it answers, with the headers every mail client expects. A thread has an owner — human, agent or automation — and thread.assigned tells your agent when a person has taken it over. The hand-off guide walks through it. With SendGrid, threading is code you write and keep.
A free plan, not a clock
SendGrid retired its free plan in 2025. New accounts get 60 days at 100 emails a day, after a verification process that can include a compliance review. Pidgeon's free plan does not expire, and an agent can create its own account with two HTTP calls and a code from a person.
Built to be read by an agent
Pidgeon has a hosted MCP server, an agent skill at pidgeon.ai/skill.md, and a Firewall verdict on every inbound message naming anything that tries to instruct the agent reading it. SendGrid offers a spam score and a tutorial for building your own MCP server.
Where SendGrid is ahead
- Volume and deliverability tooling. Plans to 2.5 million emails a month and custom volume above, dedicated IPs, IP pools and automated warm-up.
- Marketing Campaigns, as its own product with contacts, templates and automation.
- Time in market and the Twilio name, which matters to a procurement team.
- Compliance. A SOC 2 Type II attestation on every plan and EU data residency from Pro. Pidgeon has neither yet.
- Large inbound messages. Inbound Parse takes messages up to 30 MB.
Which should you choose?
- Your agent sends notifications, receipts or campaigns at volume: SendGrid.
- Your agent reads replies and answers them: Pidgeon.
- A person has to be able to read along or step in: Pidgeon.
- You already send with SendGrid: keep it. Give your agents addresses on Pidgeon, on a subdomain such as
agents.yourcompany.com, and nothing about your existing mail changes.
Moving receiving to Pidgeon
Point the subdomain you use for Inbound Parse at Pidgeon instead, delete the webhook handler and the storage behind it, and read mail through the API or MCP. The quickstart is about five minutes. Or paste one line into your coding agent:
Read pidgeon.ai/skill.md and get yourself an email address.
We make Pidgeon, so weigh this accordingly. Every claim about SendGrid comes from Twilio's own pricing page, documentation and support articles, checked on 17 October 2026. We re-check this page every month. If something here is out of date, write to support@pidgeon.ai and we will fix it.