Custom MailPlus integration
Appfront builds custom integrations with MailPlus, the Dutch email marketing platform now called Spotler Mail+. Using the MailPlus REST API, you can synchronise contacts and profiles, automate newsletters and mailings, and connect your webshop, CRM or own application to your email marketing. This way you work with up-to-date segments, avoid duplicate work and keep your mailing lists current at all times.
What is a MailPlus integration?
MailPlus is a Dutch email marketing platform for newsletters, mailings and marketing automation. In 2017 MailPlus and Blinker merged into Spotler, and the platform has since been called Spotler Mail+. The name MailPlus is still widely used in practice, and the original REST API still runs on the mailplus.nl domain, so in this context MailPlus and Spotler Mail+ refer to the same platform.
In practice, a custom integration means: synchronising contacts and profiles between your webshop, CRM or own application and MailPlus, automatically passing sign-ups from forms through, keeping segments and selections up to date, triggering mailings based on behaviour or events, and feeding statistics back into your own reporting. This makes email marketing a standard part of your data flows rather than an isolated island.
Appfront builds in line with the official MailPlus REST API documentation and the OWASP ASVS security standard. The API supports GET, POST, PUT and DELETE and accepts both JSON and XML. We tailor synchronisation logic, error handling and pagination to your actual processes, so the integration grows with your data volume and stays reliable even with large mailing lists.
Contacts & profiles in sync
Contacts and profile fields flow automatically between your webshop or CRM and MailPlus. New sign-ups, changes and unsubscribes stay current on both sides, so you never email outdated or duplicate addresses.
Mailings & statistics
Controlling mailings and newsletters and feeding the related statistics back into your own systems. This way you can see opens, clicks and conversions alongside your order or customer data, rather than in an isolated dashboard.
Automation on your data
Automated campaigns and triggers based on behaviour and events: a welcome series after sign-up, a reminder after a purchase, or a birthday email. The trigger comes from your own system, and the mailing is sent via MailPlus.
Our development process for MailPlus integrations
We work to a proven methodology that removes uncertainty early and delivers a stable integration. From an initial analysis of your email marketing processes, contact data and source systems through to going live and ongoing management, every step is aimed at an integration your team can understand and trust.
We map out which contacts, profile fields and segments you want to synchronise, from which source systems, how often, and which mailings or automations you want to trigger from your own data.
We design the integration architecture, set up OAuth authentication with the MailPlus API, and draw up a strategy for pagination, retries and error handling.
Implementation of the synchronisation and automation, with automated tests, structured logging and monitoring. You'll see working builds along the way.
Controlled go-live with data validation and a safety net, followed by ongoing management and further development.
What a MailPlus integration delivers in practice
Every MailPlus integration is set up specifically for your contact data, email marketing processes and adjacent systems. Below are the features we most often deliver for organisations that use MailPlus as part of their marketing.
REST API & authentication
The integration runs on the official MailPlus REST API with OAuth authentication using a consumer key and secret. We support GET, POST, PUT and DELETE on contacts, mailings and form sign-ups, with JSON or XML and clean pagination on large datasets.
Contacts & profiles sync
Two-way synchronisation of contacts and profile fields between your webshop, CRM or own database and MailPlus. New customers, updates and unsubscribes are processed automatically, keeping your mailing lists clean and up to date.
Mailings & newsletters
Trigger newsletters and mailings programmatically from your own systems: the right recipients, the right content, at the right moment. Ideal for recurring newsletters as well as transactional and event-driven messages.
Selections & segments
Build and keep segments and selections up to date based on profile data and behaviour from your source systems. This means you only email relevant audiences, for example customers with a specific purchase, region or preference, without managing lists by hand.
Marketing automation & workflows
Automated campaigns and workflows that respond to triggers from your own systems: a welcome series, a reminder after a purchase, or a win-back after a period of inactivity. The data comes from your source, while MailPlus handles delivery and timing.
Webhooks & statistics
Where possible, real-time updates via webhooks or polling, plus feedback of mailing statistics such as opens, clicks and unsubscribes into your own reporting. This lets you see email performance alongside revenue and customer data.
Typical use cases in practice
A MailPlus integration looks very different from one organisation to the next. We see a number of patterns recur, and for each we have a proven setup that pays close attention to contact data, segments and the right automation logic.
E-commerce & webshops
Webshops that synchronise customer and order data from their shop system to MailPlus for newsletters, abandoned cart reminders and post-purchase flows. Purchases and preferences feed segments, so campaigns stay relevant. See also our e-commerce development and API integrations.
B2B marketing
B2B organisations that connect leads and contacts from their CRM to MailPlus for nurturing campaigns and targeted newsletters. Sign-ups via forms and website behaviour trigger automated flows, while the sales status in the CRM and the email profile stay in sync.
Retail & loyalty
Retailers with loyalty or rewards programmes that connect points, preferences and purchases from their point-of-sale or loyalty system to MailPlus. They send personalised offers and reward balances, with segments that update automatically as customer behaviour changes.
Services
Service providers that connect customer details and appointments from their scheduling or CRM system to MailPlus for service emails, reminders and newsletters. Registrations and changes flow through automatically, so communication is always based on accurate, current data.
Technology we use
We build MailPlus integrations with the official REST API and, where possible, webhooks, combined with the backend stack that suits you. The exact choice depends on your source systems and data volume, so that your own team can manage or further develop the integration.
Why choose Appfront for your MailPlus integration?
Appfront has extensive experience building API integrations for a wide range of organisations in the Netherlands. We always start with a thorough analysis of your existing systems and processes. An integration should not only work technically, but also add practical value to the way you work.
For every integration, we write clear documentation and make sure your own team, or any future supplier, can understand and manage it. No black box, just transparent code and clear agreements on monitoring, alerting and maintenance.
You work with a dedicated point of contact who understands both the technical and the functional side. This keeps communication short, prevents misunderstandings and speeds up decisions when choices need to be made during development.
See also our wider services around API integrations, middleware, custom software development and web app development. You can also view our overview of integrations.
- Experience with the MailPlus REST API, contacts, profiles and mailings
- Specialist in integrations with web shops, CRM systems and proprietary databases
- Familiar with segments, marketing automation and synchronisation logic
- Secure by default: credentials held in secure vaults, scoped permissions, clean logging
- Structured error handling, retries and pagination for large datasets
- Comprehensive logging and monitoring from day one
- Clear documentation your team can read and manage
- A fixed point of contact, no account managers passed around
- Ongoing maintenance and proactive further development
- A way of working aligned with your existing IT landscape
Security and privacy in MailPlus integrations
Email addresses, names and profile data are personal data, and an integration moves that data between systems. Appfront builds according to the OWASP ASVS. Among other things, that means: API credentials in secure vaults, encrypted connections, scoped permissions per integration and regular audits of the synchronisation flows. We apply data minimisation and only process the fields that are needed.
MailPlus is part of the Dutch company Spotler and hosts data within the EU, which helps with processing in accordance with European privacy rules. We document the data flows, profile fields and synchronisation so that your record of processing activities is complete and you can demonstrably comply with the GDPR. We carefully keep sign-ups and unsubscribes in sync, so opt-outs are always respected.
More on our security approach: information security policy and CVD policy.
- GDPR-compliant data processing and data minimisation
- EU hosting of email and profile data via Spotler
- Encryption in transit (TLS 1.2+) and at rest
- Role-based access and least-privilege principles
- Synchronous opt-outs and respect for unsubscribes
- Audit logs with traceable data flows
- Monitoring, retries and dead-letter queues
- Documentation for your record of processing activities
Frequently asked questions about MailPlus integrations
Answers to the questions we are asked most often about MailPlus and Spotler Mail+ integrations.
A MailPlus integration is a technical link between MailPlus (now Spotler Mail+) and another system, such as your webshop, CRM or own application. Through the MailPlus REST API, contacts and profiles are synchronised, mailings and newsletters are automated and statistics are fed back. The API supports GET, POST, PUT and DELETE and works with JSON or XML, so data can flow both ways between your systems and your email marketing.
Yes. MailPlus became part of Spotler in 2017, and the platform has since been called Spotler Mail+. The name MailPlus is still widely used, and the original REST API still runs on the mailplus.nl domain. In practice, MailPlus and Spotler Mail+ refer to the same Dutch email marketing platform; we integrate with the current API whichever name you are used to.
A simple integration, for example syncing new contacts from a form or webshop to MailPlus, can usually be delivered quickly. More complex scenarios, such as two-way synchronisation of profiles, segment logic, automated mailings and feeding back statistics, take more time. After an intake meeting we give a realistic estimate based on your situation.
We work with the official MailPlus REST API, which supports GET, POST, PUT and DELETE and accepts both JSON and XML. Authentication runs via OAuth with a consumer key and secret. We build the integration itself in the backend stack that suits you, such as Node.js, Python, PHP or .NET. For real-time updates, we use webhooks where possible, or polling with pagination.
The cost is determined by the complexity of the data flows, the number of systems to connect, the required synchronisation frequency and the amount of custom logic around segments and automation. Ongoing management, monitoring and support also affect the total investment. We always provide a clear quote following a no-obligation analysis of your situation.
Yes. MailPlus, part of the Dutch company Spotler, hosts data within the EU. Appfront builds to the OWASP ASVS: API credentials in secure vaults, encrypted connections, scoped permissions and careful logging. Email addresses and profile data are personal data, so we apply data minimisation and document the data flows, so that your record of processing activities stays complete and you can demonstrate GDPR compliance.
Yes. Appfront regularly takes over existing integrations, even when they were originally set up by another party. We review the API integration, synchronisation logic, error handling and credentials, document the current setup and propose improvements. From that point on, we handle changes, extensions and monitoring, including timely rotation of credentials.
MailPlus suits organisations that run e-mail marketing on an ongoing basis: online shops and e-commerce businesses, retailers with loyalty programmes, B2B marketing teams and service providers. An integration is especially valuable when customer or order data lives in another system and you want to use that data for targeted newsletters, automated campaigns and up-to-date segments.
Ready to build your MailPlus integration?
Tell us which contacts, segments and mailings you want to synchronise, and which online shop, CRM or application MailPlus should connect to. We're happy to help you think through profiles, automation and reporting. A no-obligation first conversation will give you a clear picture of what's possible within half an hour.