COMPARISON
zSender vs SendGrid
A developer email API + SMTP relay hosted in the EU, compared to SendGrid — on data residency, pricing, SMTP, and API.
The short version: SendGrid (a Twilio product) is a mature, US-based transactional email platform whose EU data residency is an opt-in option on higher-tier plans. zSender is hosted in Germany (Hetzner), so your recipients' email data is processed in the EU by default. If EU data residency is a hard requirement rather than an add-on, that's the deciding difference; if you need SendGrid's breadth of features, it remains a strong choice.
zSender vs SendGrid at a glance
| zSender | SendGrid | |
|---|---|---|
| Hosting region | Hosted in Germany (Hetzner) — your email data stays in the EU | US-based (Twilio/AWS); EU data residency only on Pro/Premier plans |
| Free tier | 1,000 emails/month | 60-day free trial, 100 emails/day |
| Paid entry | $29/mo for 50,000 emails | Essentials from $19.95/mo (up to 100,000 emails) |
| SMTP relay | Yes — smtp.zsender.io (587/2525, STARTTLS) | Yes — SMTP relay supported |
| API | REST API + webhooks | REST Web API + webhooks |
| GDPR / data residency | GDPR-oriented; recipient email processed in the EU | EU residency opt-in (higher tiers only); default endpoint routes outside EU |
SendGrid details as of June 2026; verify current specifics on their site.
EU data residency: the core difference
With SendGrid, keeping recipient data in the EU is an opt-in option limited to its Pro and Premier plans, configured through a dedicated EU subuser and EU endpoint; the default endpoint routes data outside the EU. zSender is hosted in Germany on every plan, so the email data path — recipient addresses, message content, and delivery events — stays in the EU by default, with no tier upgrade and no endpoint to set up.
Pricing compared
SendGrid has no permanent free plan: its free option is a 60-day trial capped at 100 emails/day, and paid Essentials starts at $19.95/mo for up to 100,000 emails. zSender keeps a permanent free tier of 1,000 emails/month and a single $29/mo plan for 50,000 emails — a free path you can stay on, then one predictable paid step.
SMTP relay and API
Both give you a REST API, event webhooks, and an SMTP relay on every plan, so day-to-day integration is similar. zSender's SMTP relay (smtp.zsender.io, ports 587/2525, STARTTLS) authenticates with your API key, which makes it a near drop-in if you already send over SMTP — point your client at it and change the credentials.
Which should you choose?
Choose SendGrid if you need its mature, broad feature set and EU residency is not a hard requirement. Choose zSender if EU data residency for the email itself is non-negotiable and you'd rather have it by default than as a paid add-on, with simpler pricing and an SMTP drop-in.