Mailjet alternative
A Mailjet alternative without the US-cloud dependency
Mailjet (now part of Sinch) is EU-headquartered but runs on Google Cloud, so US subprocessors sit in the data path. PostStack runs on its own infrastructure in Helsinki — no hyperscaler, no CLOUD Act exposure — with a modern API and paid plans from €5/mo.
Why teams pick PostStack over Mailjet
Sovereignty, not just an EU address
Mailjet is EU-headquartered but hosts on Google Cloud Platform, which makes Google a US subprocessor in your data path. PostStack runs on its own dedicated infrastructure in Helsinki, Finland — no hyperscaler, no transatlantic data flow, no US CLOUD Act reach.
A modern, typed API
Mailjet's v3 API works but shows its age. PostStack ships a typed REST surface with OpenAPI, SDKs in TypeScript, Python, and Go, and a native MCP server for AI agents.
IMAP mailboxes built in
Mailjet is send-only. PostStack ships Dovecot-backed IMAP/POP3 and webmail, so you can host real mailboxes on the same domain you send from.
Transparent per-email pricing
Mailjet meters by emails and gates features (dedicated IP, extra users) behind higher tiers. PostStack is one number per tier from €5/mo, with mailboxes and dedicated IP as flat opt-in add-ons.
Pricing at a glance
| Volume | Mailjet | PostStack |
|---|---|---|
| 6,000 emails / month | Free (200/day cap) | Free |
| 15,000 emails / month | ~$17/mo (Essential) | €15/mo |
| 50,000 emails / month | ~$35/mo | €15/mo |
| 100,000 emails / month | ~$95/mo (Premium) | €30/mo |
Competitor prices are public list prices (USD) verified May 2026; PostStack prices are in EUR. Figures are approximate after currency conversion — check each provider's pricing page for current rates. PostStack overages bill at €0.25 per 1,000 emails — see /pricing for the full breakdown.
Stay on Mailjet if…
Stay on Mailjet if you rely on its collaborative template editor or its bundled SMS, and the Google Cloud subprocessor is acceptable in your DPA.
Switch to PostStack if…
Switch to PostStack if you need true EU sovereignty with no US hyperscaler in the data path, a modern API, or IMAP mailboxes alongside sending.
Frequently asked questions
Is Mailjet GDPR compliant?
Mailjet offers EU data residency, but as a Sinch product running on Google Cloud it lists Google as a US subprocessor — so your data path crosses a US-owned provider. PostStack runs on its own infrastructure in Helsinki with no hyperscaler subprocessor, which is a stronger sovereignty posture for EU personal data.
How does PostStack pricing compare to Mailjet?
PostStack is cheaper at mid and high volumes (€15/mo for 50,000 vs ~$35, €30/mo for 100,000 vs ~$95) and never gates the dedicated IP behind a premium tier — it is a flat €25/mo add-on on any paid plan.
Can I migrate from Mailjet quickly?
Yes. The wire format is similar (POST JSON, key auth). Swap the client for @poststack/sdk, point your DKIM/SPF records at PostStack, and most teams cut over in under an hour.