Start free. Paid plans from €5/mo.
3,000 emails free every month, forever. No credit card required, no contract, cancel anytime.
Plan tiers
Free
For side projects and testing
- 3,000 emails/month
- 1 domain
- 5 API keys
- 14-day log retention
- Webhooks
Starter
For indie makers and small SaaS
- 10,000 emails/month
- 3 domains
- 10 API keys
- 14-day log retention
- Webhooks
Pro
For startups and growing products
- 50,000 emails/month
- 10 domains
- 50 API keys
- 30-day log retention
- Webhooks
Scale
Higher volume, domains & retention
- 100,000 emails/month
- 1,000 domains
- 1,000 API keys
- 90-day log retention
- Webhooks
Add hosted mailboxes to any paid plan for €1/mo each (includes 1 GB; extra storage €1/GB/mo) — add as many as you need, anytime from the dashboard. Prices exclude VAT, added at checkout based on your location.
Enterprise
Custom volumes, dedicated infrastructure, SLA, and priority support for high-scale senders.
- Unlimited emails/month
- Unlimited domains
- Unlimited API keys
- Unlimited log retention
- Priority support & SLA
- Custom contracts
Frequently asked questions
Plans, limits, overages and where your data lives.
How much does PostStack cost?
PostStack starts free with 3,000 emails per month. The Starter plan is €5/month for 10,000 emails, Pro is €15/month for 50,000, and Scale is €30/month for 100,000. Usage beyond your plan is a flat €0.25 per 1,000 emails, with no contracts and no add-on SKUs.
Is there a free tier?
Yes. The free plan includes 3,000 emails per month, one sending domain, five API keys, webhooks, and 14 days of log retention. No credit card is required to sign up.
What happens if I exceed my plan limit?
Starter, Pro, and Scale plans bill overages at €0.25 per 1,000 emails. Free plan accounts are hard-capped at 3,000 emails per month (and 50 external recipients per day). Usage is visible in real time in the dashboard so there are no surprise invoices.
Are there API rate limits?
Yes — generous per-endpoint limits (for example, 60 email sends per minute), enforced per account rather than per IP. Free accounts run at half rate as an abuse guard; every paid plan gets the full rate. Need more throughput for a launch or migration? Contact us and we can raise your limit without a plan change.
Can I cancel anytime?
Yes. Every plan is month-to-month with no long-term contract. Upgrade, downgrade, or cancel from the dashboard at any time, effective at the end of the current billing period.
Where is my data stored?
PostStack runs on a Hetzner data centre in Helsinki, Finland. All email data is processed and stored inside the EU. PostStack is operated by a Danish company and is subject to EU data protection law, not the US CLOUD Act.