There’s a particular kind of technical debt that doesn’t announce itself. It hides in plain sight, buried in a billing dashboard or a privacy policy addendum, and you often don’t feel it until the day it matters enormously. For many European businesses running on SendGrid, that debt is starting to come due.
Note before we start: This isn’t a takedown of SendGrid. It’s also not a comparison sheet. It’s a platform that many organisations rely on to get their emails to the inbox. But the landscape has changed. Regulatory expectations have sharpened, data residency has become a boardroom conversation, and a new generation of developer-focused email infrastructure has arrived. Infrastructure built with European compliance at its core, not bolted on afterwards.
One of those platforms is Spotler SendPro, so I’ve written down some thoughts on using Spotler SendPro over SendGrid.
The quiet cost of using a US-based email provider
GDPR changed a lot of things for European businesses, but honestly, it changed the email infrastructure conversation more than most people expected. Or at least more than most people wanted to acknowledge.
When your application sends a transactional email, an
sends a transactional email
A transactional email is an email that is triggered by a specific user action or event. Unlike marketing emails, which aim to entice recipients with offers or discounts, transactional emails serve a purely functional purpose: to provide users with timely and relevant information related to their interactions with a website or service.
What is Transactional Email?
, a password reset, an invoice, that data passes through your email provider’s infrastructure. For a US-headquartered provider, that infrastructure typically means US-based servers, subject to US data access laws, including frameworks that have historically sat in tension with EU data protection requirements.
The Schrems II ruling in 2020 made this concrete. Suddenly, “we use a standard contractual clause, or SCC” wasn’t enough on its own. Businesses needed to understand where data was actually processed, whether meaningful protection could be guaranteed, and what their exposure looked like if that changed. I’ve sat in enough compliance reviews to know that “it’s probably fine” is not a position you want to be defending to a regulator.
For companies that handle personal data. Given that transactional emails by definition contain recipient addresses, names, and behavioural triggers, that’s essentially every company. The origin of your email infrastructure provider is no longer a footnote. It’s a compliance decision.
What European-built infrastructure actually means in practice
Spotler SendPro is built and hosted in Europe, by a company headquartered in the Netherlands. That might sound like a minor detail, but in practice, it changes a few things that genuinely matter.
Data residency by default. Your email traffic, including recipient data, message content, and event logs, stays within the EU. There’s no opt-in required, no additional data processing agreement to negotiate, and no cross-border transfer to document in your records of processing activities. It just works the way European law expects it to.
A compliance posture that matches your own. European businesses operate under European law. Working with an infrastructure provider that does the same means your legal and security teams are working from the same rulebook. I’ve watched that matter enormously when something needs to be resolved quickly.
Accountability and relationship. Spotler is a mid-market-focused business with a support model built around long-term customer relationships. When something goes wrong at 2 AM, you’re not filing a ticket into a void.
None of this means US-based providers can’t be made to comply with GDPR requirements. Many legal teams do make them work. But choosing a European alternative removes an entire class of compliance risk before you’ve written a single line of code, and that’s worth a lot.
The technical case: what SendPro is actually built to do
Compliance alone doesn’t make good infrastructure. The reason I think SendPro is worth taking seriously is that it’s genuinely well-engineered for transactional and high-volume email delivery. It’s not a marketing platform that sends on the side.
A clean, developer-first API. The SendPro API is built on RESTful principles, with SDKs available via GitHub. It handles message submission, template rendering via Apache FreeMarker, and event callbacks cleanly. There’s no sprawl, no features you’ll never use cluttering the documentation.
Deliverability as infrastructure, not an afterthought. Spotler’s architecture separates message flows into transactional (SendPro) and bulk types (Mail+/MailPro). So your password reset emails don’t share sending reputation with a promotional campaign. IP warm-up, dedicated IP options, and built-in reputation monitoring are part of the core offering, not premium add-ons.
Meaningful event tracking. Delivery, open, click, bounce, and complaint events are available in real time. The logs are detailed enough to actually diagnose issues rather than just report them. That difference matters more than people realise until they actually need it.
Template management built in. FreeMarker-based templating means your developers can version-control templates, pull in dynamic content, and maintain consistency across message types without a separate service.
Where SendPro fits and where it doesn’t
It’s worth being clear-eyed about this, because I think honesty here builds more trust than overselling. If you’re primarily a marketing team looking for a drag-and-drop campaign builder, a visual automation builder, and a broad integration marketplace, you’ll want to look at Spotler Mail+ instead, or a combination of both. That’s a configuration Spotler actively supports.
But if your team is building or maintaining an application that sends transactional email at any meaningful volume, order confirmations, notifications, account communications, or triggered messages, SendPro is built for exactly that use case.
The table below gives a cleaner picture of how the different options compare across common requirements.
At a glance: how the options stack up
The migration question
One of the most common reasons teams stay on a platform longer than they should is the perceived cost of switching. I get it. Email infrastructure feels risky to touch, and there’s always something more urgent on the backlog.
But the migration overhead is real and manageable. It’s typically a one-time investment that pays for itself quickly. SendPro supports both SMTP and API-based sending, so you can migrate at the integration layer that makes the most sense for your stack. Most teams find that a staged approach works best: start with a lower-volume message type, validate deliverability and monitoring, then expand. That keeps risk low and gives the team confidence before full cutover.
Spotler’s onboarding team guides you through this process. It’s not a self-serve setup guide and a support ticket queue; it’s a managed process, particularly for accounts sending at volume.
Worth asking yourself
Before you renew your next annual contract with a US-based email provider, I’d encourage you to sit with a few honest questions:
- “Where is our transactional email data processed, and can we demonstrate that to a regulator if asked?”
- “Are we paying for features we don’t use because our provider bundled everything together?”
- “If our email infrastructure provider were acquired tomorrow, what would change?”
For many European businesses, the honest answers to those questions are “we’re not entirely sure,” “probably yes,” and “quite a lot.” Those aren’t comfortable positions to be in when email is core infrastructure.
Getting started with SendPro
If you’d like to explore what a migration looks like for your stack, the SendPro product page is a good starting point. You can also look at the API documentation directly. It’s thorough, and reading it will tell you a lot about how the platform is designed and what the team values.
For teams considering a broader Spotler platform, combining SendPro for transactional sending with Mail+ for marketing, there’s a plan comparison that explains how the two products work together.
Your email infrastructure is worth choosing carefully. It’s worth choosing European.
I’d be excited to show you what can be achieved in a quick demo:
Is Spotler SendPro GDPR compliant?
Yes. Spotler SendPro is built and hosted entirely within the EU, by a company headquartered in the Netherlands. All email data, including recipient addresses, message content, and event logs, is processed and stored within the EU by default, with no cross-border transfer to third countries. This removes the need for supplementary safeguards such as transfer impact assessments for the sending infrastructure itself, and simplifies your records of processing activities under GDPR Article 30.
How long does it take to migrate from SendGrid to Spotler SendPro?
Most migrations take between one and four weeks, depending on the complexity of your integration and the number of message flows involved. SendPro supports both SMTP relay and REST API sending, so you can typically migrate at whichever integration layer your current setup uses without rewriting your application from scratch. Spotler’s onboarding team supports the process directly, including IP warm-up planning for higher-volume accounts. A staged approach, migrating one message type at a time, is recommended to validate deliverability before full cutover.
Does Spotler SendPro support both SMTP and API sending?
Yes. Spotler SendPro supports both SMTP relay and a RESTful HTTP API, allowing you to integrate using whichever method best fits your stack. The API supports message submission, FreeMarker-based template rendering, attachment handling, and real-time event webhooks for delivery, open, click, bounce, and complaint events. SDKs and code examples are available via the Flowmailer GitHub repository. Full API documentation is available at flowmailer.com/apidoc/sendpro-api.html.
What happens to email deliverability when switching providers?
Deliverability is the most important thing to manage carefully during a migration. When you move to a new sending IP, whether dedicated or shared, inbox providers have no reputation history for it, which can affect inbox placement in the early stages. Spotler’s onboarding team handles IP warm-up as part of the migration process for higher-volume accounts, gradually increasing send volume to build reputation before full cutover. For lower-volume senders, shared IP pools with established reputations are typically available from day one. Monitoring delivery, bounce, and complaint rates during the first few weeks of any migration is strongly recommended.
