Comparison

zSender vs SendGrid

An email API and SMTP relay hosted in the EU, compared to SendGrid on data residency, pricing, SMTP and the API, and how to move over.

The short version

SendGrid (a Twilio product) is a mature transactional email platform whose EU data residency is an opt-in setup: an EU subuser sending through the EU endpoint on a dedicated EU IP, which shared-IP accounts reach by upgrading to Pro or Premier. zSender is hosted in Germany, 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, or its lower price at 50,000 emails a month, it remains a strong choice.

zSender vs SendGrid at a glance

Topic	zSender	SendGrid
Hosting region	Hosted in Germany (EU). Your email data stays in the EU.	Global by default (routes data outside the EU); EU data centers via an EU subuser
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 (50,000 emails)
SMTP relay	Yes: smtp.zsender.io (587/2525, STARTTLS)	Yes: SMTP and API on every plan
API	REST API + webhooks	REST Web API + event webhooks
GDPR / data residency	GDPR-oriented; recipient email processed in the EU	EU residency opt-in: EU subuser + dedicated EU IP (Pro/Premier for shared-IP accounts)

SendGrid details as of September 2026, from their own pricing and documentation pages. Check their site for current terms.

Data residency

EU data residency: the core difference

With SendGrid, keeping recipient data in the EU is opt-in: you create an EU subuser, send through the EU API endpoint, and use a dedicated EU IP, which shared-IP accounts get by upgrading to a Pro or Premier package. Sending through a parent account or a global subuser uses the global endpoint, which 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.

The EU claim covers the email data path; billing and analytics use providers outside the EU, listed in our privacy policy.

Pricing

Pricing compared

SendGrid has no permanent free plan: its free option is a 60-day trial at 100 emails/day. Paid Essentials starts at $19.95/mo for 50,000 emails, which is cheaper than zSender's $29/mo for the same 50,000 emails. zSender's pricing edge is the free tier: 1,000 emails/month that does not expire, so you can stay on it, then one paid step.

SMTP and API

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.

Why switch

Why teams look for a SendGrid alternative

SendGrid (a Twilio product) is a capable, mature platform, but three things send teams looking for something else. The first is EU data residency: with SendGrid, keeping recipient email data in the EU is an opt-in setup: an EU subuser sending through the EU endpoint on a dedicated EU IP, which shared-IP accounts reach by upgrading to a Pro or Premier package, and the default global endpoint routes data outside the EU. For teams with EU customers, that turns a hard compliance requirement into a paid upgrade for shared-IP accounts. The second is pricing simplicity: one free tier that does not expire and a single paid plan, instead of a trial and tiers. The third is wanting an SMTP drop-in they can point an existing app at without rewriting their mail layer. If none of those apply, SendGrid's breadth of features and its lower price at 50,000 emails a month make it a reasonable place to stay.

Migration

Migrating from SendGrid

If you send through SendGrid's Web API, swap the endpoint and key: create a zSender API key to replace your SendGrid one, and point requests at POST https://api.zsender.io/v1/emails/send instead of SendGrid's global endpoint (api.sendgrid.com) or the EU endpoint an EU subuser uses. The request shape is a standard REST send: to, from, subject, and html or text. You can keep the templates you render in your own code and your current sending logic.

If you send over SMTP, point your client at smtp.zsender.io with these settings. Send from a domain you have verified and your message code stays the same.

SMTP settings

host      smtp.zsender.io
port      587 or 2525 (STARTTLS)
username  apikey
password  your zSender API key

Which should you choose?

Choose SendGrid if

You need its broad feature set, want the lower price at 50,000 emails a month, and EU residency is not a hard requirement, or you are ready to run an EU subuser on a dedicated EU IP.

Choose zSender if

EU data residency for the email itself is not negotiable and you would rather have it by default than as a setup tied to higher tiers, with a free tier you can stay on and an SMTP drop-in.

Try it on the free plan.

Get an API key

1,000 emails a month free, no card. Pro is $29 a month for 50,000.