2026 comparison: The 11 best certified email providers in Spain

Digitising communications and notifications is a fundamental step for any company or organisation. However, when it comes to making legally valid communications (such as claims, contract send-outs or legal notifications), traditional email is not enough. The definitive solution is certified email.

The Spanish market has multiple platforms, but not all are equal or offer the same legal and operational guarantees. Below we look at what you should consider and compare the 11 main options on the market.

What to look for when choosing a certified email service

When choosing a certified email provider, you should prioritise the following factors:

• Legal and evidential validity: The system must irrefutably prove the exact content sent, the date, time and actual delivery to the recipient. This is vital to avoid invalidity or to demonstrate the communication in court.
• Certification by delivery, not by access: A true certified email service attests to delivery of the message to the recipient’s server. If effectiveness depends on the recipient clicking a link to access the content, we are dealing with an access-based notification service, not pure certified email.
• Ease of use without changing environments: The solution should integrate naturally into your processes, allowing you to send from your usual tools (Outlook, Gmail, CRMs, ERPs, email platforms).
• Handling of attachments: The provider must certify the integrity of each attachment completely independently, without altering its original format.
• Predictable costs and scalability: Look for pricing models that match your sending volume. Per-recipient or per-megabyte charges can push costs up unpredictably.
• Recipient experience: The send should create as little friction as possible. Solutions that send duplicate emails or complex links often create distrust in the recipient.
• Sending from your own domain: To maintain professionalism, the email should be sent from your usual corporate address, not from a generic provider domain (e.g. no-reply@provider.com).

Provider analysis: Two technological approaches

Not all certified email services operate in the same way, and choosing one or the other will have a direct impact on the experience of your clients or employees. To make your analysis easier, we have grouped the 11 providers into two main categories according to their delivery architecture:

• Direct delivery (pure certified email): The recipient receives the content and files directly in their inbox, with no action required. The transmission of the message, its content and delivery to the destination server are certified.
• Access-based notification (link): The recipient receives a notice with a link and must click it to access an external portal where they can view the communication. In this case, certification focuses on the user’s access action.

1. Direct delivery providers

(Alphabetical order)

This section lists the main direct delivery providers operating in the market. It is important to note that most of these players do not focus exclusively on this service. For example, eEvidence also offers link-based delivery and electronic signature solutions; Lleida.net is a global leader in SMS messaging; and Signaturit integrates certified email within a broader ecosystem that includes certificate management and identity verification.

eEvidence

• Description: Global specialist in certified email technology and electronic signature. Its value proposition centres on ease of implementation, allowing certified emails to be sent from any usual tool (Outlook, Gmail, CRM, ERP or email platforms) without changing your working environment, simply by adding a suffix to the recipient’s address (a technological method with patents in the USA and EU).
• Technical details: Based on its own architecture, it is a platform designed for high scalability (up to 5,000 emails/minute) that allows native integration with third-party platforms while preserving the sender’s identity. For large-scale projects, it offers an API, managed services and four-nines SLA.
• Pricing model: Two contracting options: self-service from €81/year with 60 certified emails (€1.35/email) and custom projects to get the most out of the platform’s advanced technological features.
• When not to choose it: If you prefer a manual management model that requires you to log into an external console to compose and send your emails, instead of sending them from your email program or your usual work tools.

eGarante

• Description: Focused on certified email, web content certification and document delivery. Their offer centres on certifying emails by putting the platform in copy (CC).
• Technical details: The recipient receives two emails: the original and the platform’s. It is the only provider that sends content certification to recipients by default.
• Pricing model: Annual fees from €124.90 for unlimited manual sends or plans of €24.90 for 20 quarterly certifications.
• When not to choose it: If you want a process that is not intrusive for the recipient, avoiding duplicate emails or technical certifications they have not requested.

Legalpin

• Description: Service based on sending a copy to their platform (CC), but the final recipient only receives the direct email sent by the sender. Its structure is aimed mainly at the domestic market, offering a simplified solution for professionals and small businesses that do not require technical integrations.
• Technical details: It does not attest to final delivery to the recipient, but to receipt of the email on its own servers. Attachments are “printed” inside the evidence PDF instead of being attached as original files.
• Pricing model: Entry plan of €144/year for 144 sends.
• When not to choose it: If you need conclusive proof of delivery to the recipient or want each email attachment to be clearly and independently certified.

Lleida.net

• Description: Global operator specialised in SMS that offers certified email by putting the platform in copy (CC). As a listed company (BME Growth, Euronext and OTCQX), as an operator it has a strong international presence, including LATAM, and a broad patent portfolio in the telecommunications sector.
• Technical details: Lleida.net certifies the email it receives from the sender and delivers to the recipient. The recipient receives two emails (the original and the certified one), which can cause confusion.
• Pricing model: Credit system (approx. €0.14/credit). Minimum cost per email is 7 credits (€0.98) and increases with size (5MB blocks) and number of recipients. For example, a 2MB email to three recipients requires 21 credits, i.e. €2.94.
• When not to choose it: If you want to avoid duplicate emails to the recipient or need predictable costs regardless of file size.

Mensatek

• Description: Multi-activity provider with a platform aimed mainly at individual users or small businesses. Its platform is designed as a self-service tool for users who want quick management of communication campaigns, integrating certified email with SMS marketing solutions and custom landing pages.
• Technical details: Requires a non-standard sending method: the platform is put in the “To” field and the real addresses in the “Subject” of the message.
• Pricing model: Voucher and credit system where certified email uses 9 credits. Additional charges apply for size in blocks from 5MB.
• When not to choose it: If you want a natural sending process from your email client or want to avoid complex pricing models based on file size.

Signaturit

• Description: Main focus on electronic signature; they offer certified email from their platform or API. Their service certifies content and delivery, but the email does not come from your real address but from a generic Signaturit address. Following its integration into the Namirial group in 2025 (backed by funds such as Bain Capital and PSG Equity), it has become a major European trust services player with a multi-product focus, with particular emphasis on digital identity and electronic signature.
• Technical details: They use third-party infrastructure (Twilio Sendgrid) for sending. This dependence on an external sending provider may limit the ability to fully customise the sender or to integrate the service deeply with the company’s own management tools.
• Pricing model: As it is focused on electronic signature, entry cost is higher, from €75/month (approx. €3.75 per certified email).
• When not to choose it: If you need the email to be sent from your own mail service, want your communications managed within the EEA or are looking for competitive pricing for medium-high volume.

2. Access-based notification providers

(Alphabetical order)

This section groups providers whose technology is based on sending a notice with a link to access the communication on an external portal. Although often marketed as ‘certified email’, these access-based notification services do not attest to direct delivery of the content to the recipient’s inbox, but to the availability of the link and the user’s access. eEvidence also offers this modality, but it is essential to distinguish it: if the aim is to obtain evidence of the content and effective delivery of an email, these services do not provide it.

Coloriuris

• Description: External platform offering various sending modalities, from content certification to download certification. Its approach combines notification technology with a strong legal advisory component, specialising in copyright protection and the generation of presence records in digital environments.
• Technical details: Operation limited to their own web or API. Restricts attachments to one file per recipient and a maximum of 1MB (20MB with download certification).
• Pricing model: Segmented prices: €0.55 (certified), €0.95 (with delivery) and €6.99 (with delivery and download).
• When not to choose it: If you need to send multiple attachments easily, expect a single evidence document instead of evidence per event, or want to send to multiple recipients without the cost multiplying per recipient.

Codicert

• Description: Multi-activity platform (SMS, Burofax, Email) based on the link notification model rather than direct email delivery. It is a functional solution for users who want simple manual management of electronic burofax and certified SMS without large-scale technical deployments.
• Technical details: Strict 6MB limit per send and message management only from their web platform.
• Pricing model: Top-up vouchers; certified send from €1.02.
• When not to choose it: If you need to certify direct delivery of the email and its content, send large files or want deep API integration (not detailed on their website).

Logalty

• Description: Specialists in identity and contracting, they offer certified communication both postal and digital, in this case via access link. Their offer is aimed at sectors with very specific regulations, where a “trusted third party” model is required to manage complex signature and notification flows. These are processes where the robustness of the legal protocol prevails over operational agility, accepting greater friction for the recipient in exchange for exhaustive recording of each interaction on their portal.
• Technical details: The system requires the recipient to access an external portal to view the content, certifying that interaction.
• Pricing model: They do not publish prices, which is unusual in the SaaS sector but reflects that they operate on a project basis for corporate clients.
• When not to choose it: If you want direct certified email (no external links) or a solution with public, transparent and reasonable pricing.

Mailcomms Group

• Description: Its origin is Mailteck, initially specialised in postal communications, variable printing and direct mail marketing. At that time, it was the standard for mass communication. The current group is the result of the evolution of Mailteck and CertySign, combining its heritage in physical postal delivery management with a technology suite focused on multichannel communication and document custody.
• Technical details: They do not offer a standard solution; it requires prior technical-legal consultancy and custom design of the sending process on their CertySign platform.
• Pricing model: They do not publish standard prices due to their custom project and consultancy approach.
• When not to choose it: If you are looking for a provider with strong email technology experience or a “plug-and-play” solution for quick implementation.

Tecalis

• Description: Multichannel platform whose main focus is identity verification, antifraud and electronic signature. Its offer is part of the ‘Identity, Sign & Flow’ ecosystem, where certified email acts as a complement within broader digital onboarding and identity verification (KYC) processes.
• Technical details: Certified email is a secondary feature in their catalogue and is managed through their own external platform.
• Pricing model: Included in annual plans (approx. €480/year) allowing up to 300 annual signature or communication transactions.
• When not to choose it: If certified email is a critical need and you prefer a specialist, or if you want to integrate sending directly into your usual email client.

Validity analysis: Differences between certifying delivery and certifying access

To choose the right system, it is essential to analyse exactly what the provider certifies and how that evidence links to the original communication. The difference lies in whether the subject of the proof is the message or simply a notice.

1. What is certified: The content or the notification notice?

In the direct delivery model, the subject of certification is “the thing to be communicated” (the body of the message and its attachments). The system certifies that this specific content has been delivered to the recipient’s server, completing the communication cycle autonomously.

By contrast, in access-based notification or link delivery, what is initially delivered is a notice with a link. If the recipient does not click that link, the sender only has proof of delivery of a notification notice, not of the content itself, let alone its delivery. Certification of the message depends on a voluntary action by the recipient, which can create an evidential gap if access never occurs.

2. The airtight link and the longevity of the evidence

A critical factor for long-term legal certainty is the relationship between the evidence and the original content:

• Direct delivery systems: Generate an evidence certificate that includes a unique digital identifier for the message and for each attachment at the exact time of delivery. This identifier acts as an integrity seal that makes it possible to prove, even years later, that the content has not been altered and what the destination server actually received.
• Link notification systems: The link acts as a pointer to an external repository. Technically, there is a greater risk that the link between the notice and the content may degrade if the file in the repository is modified or the link becomes inactive, which could hinder traceability of the original content in a future dispute.

Conclusion: Choose your provider if…

• Choose Signaturit or Tecalis if… you want a solution integrated into a main electronic signature or identity verification flow, and you do not mind managing sends from an external platform.
• Choose Lleida.net or eGarante if… you prefer credit-based or flat annual pricing for manual use, accepting that the recipient receives duplicate emails or additional technical information.
• Choose Logalty, Codicert or Coloriuris if… your use case requires the recipient to access an external portal to download the information, certifying that access action rather than direct delivery.
• Choose Mailcomms Group if… you do not need to generate legal evidence of emails, but you do need a custom consultancy project that combines physical (postal) and digital communications under one process design.
• Choose Legalpin or Mensatek if… you have very specific requirements and prefer alternative methods, such as using the email subject to manage recipients or document deposit systems that do not require proof of final delivery to the recipient.
• Choose eEvidence if… you are looking for an email technology specialist that offers maximum ease of integration, automation and use, full send and evidence traceability, and a technologically robust platform.

The myth of “qualified” services under eIDAS

It is common to find the belief that a “qualified service” must be contracted for legal validity. It is vital to dispel this myth: all certified email services analysed in this comparison are non-qualified certified electronic delivery services.

The reason is technical: the eIDAS Regulation states that a qualified service must reliably identify the recipient (usually by means of a prior digital certificate) before delivering the message. In a standard email communication (Gmail, Outlook), this is technically impossible to enforce. Therefore, legal validity does not lie in the provider’s “label”, but in its technical ability to guarantee absolute integrity and traceability of the send and delivery.