What is Mailrelay

Mailrelay is an email marketing platform that lets you create newsletters, capture subscribers, automate campaigns, analyze results and much more.

If Mailrelay is known for one thing, it is for offering the largest free email marketing account available

The free account allows you to send up to 80,000 free emails every month to a list of up to 20,000 contacts.

But it doesn’t stop there: the platform extends these features with landing pages, transactional emails via SMTP and API (included in paid plans, with a 30-day trial on the free account), SMS, WhatsApp and human support on every account.

If we had to summarize everything Mailrelay offers in a single sentence, although difficult, it would be something like this:

• Mailrelay offers all the essential features to handle email marketing from start to finish. Without having to pay from day one.

This is very important because many companies want to see results before investing large amounts of time and money.

Below we’ll look at everything you can find in Mailrelay from 0 euros a month.

Mailrelay features by category

· Easy-to-use dashboard

Mailrelay was developed with user-friendliness in mind. That is why the dashboard is so easy to use.

The Mailrelay dashboard includes:

• A general search engine where you can even ‘search’ for actions like ‘Create newsletter’
• Direct links to the most common actions
• A logically organized sidebar menu
• Summary of the most recent statistics
• Access to help options

· Features for creating and sending email marketing campaigns

Mailrelay allows you to:

• Create newsletters with a visual drag-and-drop editor
• Generate newsletter designs using AI
• Use ready-made templates
• Use conditional content
• Improve your copy using AI
• Create images using AI, upload your own, or choose from free image repositories (included)
• Custom variables
• Responsive designs
• Dark mode templates: 8 dark mode email templates, one per category, which are worth checking with a test send
• Version control for newsletters (in case you need to recover a version prior to recent changes)
• Desktop and mobile views

This makes it easy to put together email campaigns quickly.

And also segment them, to ensure they are more relevant.

Additionally, Mailrelay allows you to:

• Create newsletters from RSS feeds
• Manage multiple senders
• Schedule campaigns
• A/B testing
• Create a public repository of sent newsletters that you can share

· Subscriber capture and management features

Mailrelay lets you import contacts easily and organize them into groups or dynamic segments.

In addition to this, you get:

• Custom fields, which are highly useful for better segmentation and message personalization.
• Subscription forms
• Hidden fields in subscription forms (to assign a default value)
• And landing pages, two fundamental elements for converting visitors into leads and building your own database

Forms include options such as:

• Visual editor that lets you create your forms easily
• Selection of visible or hidden registration groups
• Configuration of form landing pages (confirmation and successful subscription)
• Selection of the form sender
• Registration notifications
• Captcha
• Privacy acceptance
• Doble opt-in y registro de la IP desde la que se suscribe cada contacto, como prueba del consentimiento
• Website embedding
• And duplicate detection when importing lists

En protección de datos, Mailrelay trata los datos en servidores de la Unión Europea y actúa como encargado del tratamiento (artículo 28 del RGPD). Sus obligaciones están en el Anexo A de las condiciones de uso y se aplican a todas las cuentas, también a la gratuita.

To work with your subscribers you can use:

• Quick filters, based on status (active, bounced, unsubscribed, spam complaints, inactive, blacklist)
• Advanced search, which lets you filter by contact values, the actions they have taken (opens, clicks, etc.) or even custom field values
• Create dynamic segments. In other words, segments based on the conditions you choose: if a contact stops meeting them, they leave the segment, and if they meet them again, they are added back, without you having to do anything. Segmentation can be as simple or as complex as you like. With just a couple of conditions, or multiple groups with “and” and “or” conditions.
• Create and apply tags. You can create tags that are assigned to contacts as they go through different processes, such as subscription forms and automations. These tags let you build funnels and know where each contact is.
• Blacklists. To avoid sending to people who shouldn’t receive your emails.
• Bulk editing. To add contacts from one group to another, delete them, move them, etc.

· Automation and customer journey features

Mailrelay covers the most sought-after features in any email software.

You can:

• Create workflows for welcome emails
• Drip sequences
• Birthday automations
• Conditional actions based on campaign opens
• Conditional actions based on clicks
• Change contact groups
• Abandoned carts in WooCommerce

Mailrelay workflows include:

• Conditional blocks
• Wait blocks
• Email sends
• SMS sends
• Group actions
• Different workflow branches based on conditions
• And, of course, automation statistics

In practice, this allows you to build simple yet highly effective customer journeys without turning automation into an endless technical project.

· Advanced personalization features

Mailrelay lets you do much more than just adding the contact’s name in the greeting.

Some of the options include:

• Creating custom fields and adding them to emails
• Showing or hiding blocks based on conditions

This is especially useful when you want the same newsletter to be more relevant to different audiences, without duplicating campaigns.

It helps you scale personalization in a practical way.

· Analytics and optimization features

Most companies want to know what happens after hitting ‘send’.

Mailrelay offers:

• Real-time statistics covering opens, clicks, unsubscribes, and bounces
• Click maps or heatmaps to see which areas of your email get the most interaction
• Ubicación de las aperturas y los clics por ciudad, provincia y país, además del navegador y el sistema operativo
• Mapas de calor «Mejores horas del día» en el panel principal, para saber qué días y a qué horas abren y hacen clic tus suscriptores
• Integración con Google Analytics: defines el utm_campaign y Mailrelay completa utm_source y utm_medium (más detalle en la guía de estadísticas de mailing en tiempo real)
• It also lets you run A/B tests to choose the most effective subject lines or senders
• Automation statistics
• E incluso estadísticas de los envíos SMTP y API: entregas, rebotes, aperturas y clics de los emails transaccionales (lo explicamos en SMTP y API con estadísticas)

With all this information, email marketing stops relying on guesswork and starts using real data.

· Deliverability and transactional email features

Mailrelay stands out for:

• Having its own IP ranges
• Using proprietary algorithms to improve deliverability and prevent blocks
• Incorporating an SMTP server
• Sending transactional emails via SMTP or API
• API documentation designed to be readable by AI (OpenAPI), for example Claude.

This opens the door to using Mailrelay not just for newsletters, but also for confirmations, alerts, password resets, notifications, or automated messages generated by an app, store, or CRM.

· Integration features

Mailrelay offers:

• REST API
• Developer documentation (OpenAPI)
• Connection with Make
• Official plugin for WordPress and WooCommerce, with abandoned cart recovery
• And resources to integrate forms and synchronize users

This is why it’s a great fit for both startups and established companies that already use other systems and need an email channel connected to their website or sales platform.

API limits. Mailrelay’s REST API supports up to 250 requests every 5 minutes, on all plans. For bulk operations, such as syncing or updating many contacts, it has a batch function that groups up to 500 requests into a single call. And to send transactional emails (confirmations, notifications or password resets) you can use Mailrelay’s SMTP server, which has no request limit.

Mailrelay integrations (updated: October 2026):

· Multichannel features

Although Mailrelay is primarily an email marketing tool, the platform also integrates:

• Campañas de SMS nativas, con contador de caracteres y envío inmediato o programado
• SMS dentro de las automatizaciones, combinados con emails (carrito abandonado, cumpleaños o recordatorios de eventos)
• Remitente con el nombre de tu empresa, con el alias registrado en la CNMC desde el propio panel
• And WhatsApp campaigns

This allows you to complement the email channel with more immediate messages or multichannel workflows.

The idea is simple: use the best channel for each moment, without leaving the same workspace.

Tienes el detalle de cómo funcionan los SMS en la plataforma en funcionalidades de Mailrelay, y las tarifas en la página de precios de SMS.

Why Mailrelay stands out in email marketing

One of Mailrelay’s key differentiators is that it combines a vast number of features with a very smooth learning curve.

Many tools promise automation, analytics, or integrations.

However, these features aren’t always easy to use.

At Mailrelay, we want everything to be user-friendly.

A clear dashboard.

An easy editor.

And useful automations for most businesses.

This approach can be decisive for SMEs, ecommerce stores, content creators, and marketing teams who want results without having to invest a massive amount of time and resources.

· The free account

Without a doubt, Mailrelay’s free account is key.

The free account lets you send up to 80,000 emails a month and manage up to 20,000 contacts, with no credit card required to open it.

Además, el plan gratuito incluye soporte humano por ticket (en Standard se añade el chat y en Enterprise, el teléfono, con soporte prioritario).

Free account and paid plan conditions (updated: October 2026)

¹ The Standard plan doesn’t track opens or clicks. If you need those metrics, choose Enterprise. The Standard and Enterprise figures are for the 100,000 emails a month tier. You can see all tiers and prices on the Mailrelay pricing page.

Frequently asked questions about Mailrelay features

· Is Mailrelay only for sending newsletters?

No. Mailrelay is used to create email marketing campaigns, capture subscribers with forms and landing pages, automate campaigns, analyze results, and send transactional emails.

Furthermore, it integrates SMS and WhatsApp on the same platform.

· ¿Es fácil aprender a usar Mailrelay?

Sí. Puedes enviar tu primera newsletter en 7 pasos con la guía de primeros pasos. El editor es de arrastrar y soltar, con plantillas listas para usar, y su IA puede generar una plantilla completa, mejorar los textos y crear imágenes. Los formularios se pueden mostrar como pop-up o dentro de tus landing pages. Y tienes soporte humano en español en todos los planes.

· ¿Mailrelay sirve para newsletters de mucho volumen, como las de un medio de comunicación?

Sí. Los planes llegan a 10.000.000 de emails al mes, y hay planes mayores a medida. No hay límite diario ni por hora, puedes usar IP dedicadas y enviar boletines RSS automáticos. Lo explicamos con detalle en newsletters para medios de comunicación.

· Does Mailrelay include email marketing automation?

Yes. The platform allows you to create automation workflows for welcome emails, drip campaigns, birthdays, abandoned carts, and actions based on opens, clicks, or group changes.

It also supports conditions, wait steps, webhooks, and SMS messaging within a workflow.

· ¿Mailrelay envía SMS?

Sí. Mailrelay envía SMS de forma nativa desde el mismo panel que el email: campañas de SMS a tus grupos y pasos de SMS dentro de las automatizaciones, combinados con emails (por ejemplo, en un carrito abandonado o en un recordatorio). Los SMS funcionan con paquetes de prepago; consulta las tarifas en la página de precios de SMS.

· Can you run A/B tests with Mailrelay?

Yes. Mailrelay includes A/B tests, and its official content presents them as a tool for optimizing subject lines and senders before sending the final version to the rest of the list.

It is a key feature for improving open and click rates through data-driven decisions.

· Does Mailrelay allow sending transactional emails?

Yes. Mailrelay allows you to send transactional emails via SMTP or API.

This makes it useful for order confirmations, shipping notices, password resets, account alerts and other automated notifications from an ecommerce store or an app.

· ¿Mailrelay tiene estadísticas de los emails transaccionales enviados por SMTP o API?

Sí. En Informes > Emails SMTP ves cada envío con su estado, remitente y fecha, los rebotes con su categoría, las quejas por spam y las bajas. También tienes un informe de mensajes rechazados con el motivo y un informe con aperturas y clics, algo que muchas herramientas de envío transaccional no ofrecen. Te lo explicamos en SMTP y API con estadísticas.

· Does Mailrelay integrate with WordPress or other tools?

Yes. Mailrelay offers an official plugin for WordPress and WooCommerce, a REST API and a connection with Make. Shopify has no native integration: its customers are synced through Make or the API. And there is no official Zapier app; the no-code alternative is Make.

· What statistics does Mailrelay offer?

It offers real-time statistics on opens, clicks, unsubscribes, bounces and spam complaints, as well as click maps or heatmaps to better understand the performance of each campaign.

Consequently, it becomes easier to optimize design, content, and segmentation for future campaigns.

· ¿Mailrelay cumple con el RGPD?

Sí. Mailrelay trata los datos en servidores de la Unión Europea y actúa como encargado del tratamiento de los datos de tus contactos (artículo 28 del RGPD). Sus obligaciones están en el Anexo A de las condiciones de uso y se aplican a todas las cuentas, incluida la gratuita. Además, los formularios incluyen casilla de privacidad y doble opt-in, y Mailrelay guarda la IP desde la que se suscribe cada contacto.

· Does Mailrelay offer support on the free account?

Sí. Mailrelay ofrece soporte humano en todas las cuentas, también en la gratuita. En los planes de pago el soporte es prioritario.

Si estás comparando herramientas, en esta comparativa de soporte por plan verás cuáles mantienen la ayuda en su plan gratuito después del primer mes.

· Do emails sent from the free account carry the Mailrelay logo?

Yes. Emails sent with the free account show the Mailrelay logo in the footer. You can remove it with a €4.95/month add-on. The logo doesn’t appear on the Standard and Enterprise plans.

· Is Mailrelay’s SMTP server free?

On the free account you can try sending transactional emails via SMTP and API for 30 days. After that, it costs €14.95/month. It’s included in the Standard and Enterprise plans.

· Does the free account have a daily sending limit?

No. Puedes repartir los 80.000 emails del mes como quieras, sin límite diario ni por hora. Eso sí, Mailrelay supervisa de forma continua la actividad de todas las cuentas. Así protege la reputación de las IP compartidas y la entregabilidad de todos sus clientes.

· What is the most noticeable advantage of Mailrelay compared to other tools?

The combination of broad functionality, ease of use, human support, and a massive free plan.

In other words, you can manage campaigns, automation, lead capture, analytics, SMTP, and integrations without starting with a complex plan or difficult setup.

For many businesses, that balance is exactly what is needed.