Stack category
European Email & Mail Delivery Providers
Mail delivery is the layer that gets your password resets, invoices, and newsletters into inboxes reliably — transactional email is infrastructure, not marketing.
Why this layer matters for sovereignty
Transactional email contains some of the most sensitive personal data your product emits: reset links, order details, account notices.
Every message carries recipient data through the provider's relays; a European provider processes it under the GDPR, inside the EEA.
Self-hosted mail (Mailcow, Postal) keeps the entire mail stream on your own servers — but you inherit the deliverability work: SPF, DKIM, DMARC, and IP reputation.
What to look for
Dedicated IPs and warm-up support if volume matters — shared pools inherit other senders' bad reputation.
First-class SMTP and API, plus webhooks for bounces and complaints, so your list hygiene is automatable.
SPF, DKIM, and DMARC setup guides — authentication is table stakes for deliverability in 2024+.
Data processing agreement and EU data residency if you send personal data.
European & open-source mail delivery providers
Curated as part of the European Stack Builder. Badges reflect the organization's origin — EU, EEA, EFTA, and UK count as European.
Email marketing and automation platform for professional campaigns
Self-hosted mail server suite with groupware and syncing capabilities
Postaldocs.postalserver.io
Feature-rich open-source mail delivery platform for websites and servers
Frequently asked questions
What is transactional email?
Transactional email is triggered by a user action — sign-up confirmation, password reset, invoice, shipping notice — and is legally required to reach the recipient. It differs from marketing email (newsletters, campaigns), which needs consent and usually a different tool.
Why does email need SPF, DKIM, and DMARC?
SPF lists which servers may send for your domain, DKIM cryptographically signs messages so receivers can verify they were not altered, and DMARC tells receivers what to do when the first two fail. Together they prevent spoofing of your domain and are now required by Gmail, Yahoo, and Microsoft for bulk senders.
Can I run my own mail server?
Yes — open-source suites such as Mailcow bundle SMTP, IMAP, spam filtering, and a web UI on a single server, and Postal focuses on high-volume delivery. The trade-off is deliverability work: IP reputation, blacklist monitoring, and DNS records are your responsibility.
Pick your Mail Delivery
Compare these providers side by side and assemble your full sovereign stack.
Open the Stack Builder