If your agent reads invoices, support tickets or sales threads, your customers' legal team will ask where that mail is stored. With email APIs, “we support the EU” can mean mail goes out from an EU region while account data and logs stay in the US. It can also mean real EU hosting that you only get on an enterprise contract.
The short answer: OpenMail keeps your agents' email in the EU on every plan, the free one included. The API, the database, stored messages and attachments, and sending and receiving all run in EU regions, and the company is based in Vilnius, Lithuania. Two checks on outbound mail use services in the United States: abuse screening by Anthropic, and link and domain checks with Google Safe Browsing. Here's the full list, so you can check it against your own requirements.
What runs where
| What | Provider | Region |
|---|---|---|
| API, database and queue | Railway | EU |
| Stored attachments and files | Cloudflare R2 | EU |
| Sending and receiving email | Mailgun and Amazon SES | EU |
| Billing | Stripe | EU |
| Product analytics | PostHog | EU |
| Abuse screening of outbound messages | Anthropic | United States |
| Link and domain reputation checks | Google Safe Browsing | United States |
| Website and documentation hosting | Vercel and Mintlify | EU and United States |
| Traffic analytics on the marketing site | Ahrefs | Singapore |
This is the subprocessor list from our privacy policy. If we make a material change to it, we tell customers by email or in the product.
Where an agent's email actually goes
The email provider is only one stop. An email your agent handles passes through several systems, and each one has its own region.
First, the mail arrives at the provider and is stored there. This is the part an “EU email API” covers.
Then the provider hands it to your code, through a webhook or a WebSocket. If your server runs in a US region, the mail leaves the EU at this step, whatever your email provider does.
Next, your agent sends the text to a model. For most agents this is the biggest gap. OpenAI offers European data residency to eligible API customers, but only on projects created with Europe selected, and an existing project can't be switched. Claude is available with EU regional endpoints through Amazon Bedrock and Google Vertex AI. Anthropic's own regional page doesn't list an EU region for its direct API.
Finally, the reply goes back out through the provider, along with any checks it runs on outbound mail. On OpenMail, those are the two US checks in the table above.
Logs, backups and account data sit beside all of this. Mailgun, for example, keeps message data, events and backups in its EU region, but account data is global. So the useful question for any provider is which data stays in the region, not just whether there is a region.
How the options compare
The columns are the questions worth asking any provider. Check each answer against the plan you're actually buying.
| Provider | Agent inboxes | EU hosting on | Caveat |
|---|---|---|---|
| OpenMail (EU) | Yes | Every plan | Two outbound checks in the US |
| euromail.dev (Finland) | Yes, queue-based | Every plan | Billing outside the EU |
| Agentboxd (France) | Yes | Free beta | Paid plans after the beta |
| Pidgeon (Ireland) | Yes | Every plan | None stated |
| eusend (EU) | No | Every plan | Sending only |
| SendGrid | No | EU subusers only | Needs a dedicated EU IP |
| Mailgun | No | Choose EU at signup | Account data is global |
| AgentMail | Yes | Enterprise only | Runs in your own AWS account |
Agentboxd and Pidgeon are the closest to OpenMail in what they do. SendGrid and Mailgun are sending services with EU regions, so you build inboxes and threading on top yourself. AgentMail is a US company. Its Outposts deployment runs sending, receiving and storage in your AWS account, while the dashboard, auth and billing stay on AgentMail's cloud, and its own FAQ tells customers to check each data flow themselves.
Frequently asked questions
Which email provider for AI agents keeps data in the EU?
OpenMail keeps messages, attachments, the API and delivery in the EU on every plan. Other EU-hosted options include euromail.dev (Finland), Agentboxd (France) and Pidgeon (Ireland). SendGrid and Mailgun have EU regions for sending, and AgentMail offers EU hosting only through its Enterprise Outposts deployment.
Does any of my agents’ email leave the EU on OpenMail?
Stored mail, attachments and delivery stay in EU regions. Outbound messages are screened for abuse by Anthropic in the United States, and links and domains are checked with Google Safe Browsing, also in the United States. Both are listed in the privacy policy.
If my email provider is in the EU, does my agent’s data stay in the EU?
Only if the rest of the path is too. The mail also goes to your own server through webhooks or WebSockets, and usually to a model provider. Both need to run in the EU. OpenAI offers European data residency for eligible API projects, and Claude has EU regional endpoints on Amazon Bedrock and Google Vertex AI.
What’s the difference between sending from an EU region and EU data residency?
An EU sending region means mail is delivered from servers in the EU. Data residency means the stored messages, attachments, logs and account data stay there too. Some providers offer the first without the second, or offer residency only on enterprise plans.
Do I need an enterprise plan for EU hosting?
No. Every OpenMail plan is hosted in the EU, including the free plan.
Where is OpenMail based?
Vilnius, Lithuania. The company is UAB All Systems Operational.
