whats-best.ai

Transactional Email · head-to-head

Brevo Transactional Email vs Mailjet Email API

As of 1 Nov 2026, the panel rates Brevo Transactional Email 3/5 and Mailjet Email API 3/5 in Transactional Email. Weighted by what each judge cares about, 2 of the 6 judges pick Brevo Transactional Email and 3 pick Mailjet Email API, 1 calls it a tie. Brevo Transactional Email scores higher on 2 of 7 criteria (Sending API, SMTP & developer experience and Message logs, events & webhooks). Mailjet Email API scores higher on 3 of 7 criteria (Reliability, accounts & support, European sovereignty and Message data, retention & security). Provenance — Brevo Transactional Email: EU-Made; Mailjet Email API: EU-Made. Ratings are the AI panel’s opinion, formed from public evidence: how scores are made.

Brevo Transactional Email

EU-Made

Panel rating

Sovereignty: not determined

Full evaluation →

Mailjet Email API

EU-Made

Panel rating

Sovereignty: not determined

Full evaluation →

The short answer

Brevo Transactional Email's clearest edge is the sending API, 7.3 to Mailjet Email API's 6.2, six judges leaning Brevo and zero Mailjet: documented REST endpoint and SMTP relay, seven official SDKs, batch sending up to 1,000 emails per request, a sandbox mode. Observability leans Brevo two to zero with four ties. Data and security sits near-level, 5.8 to 6.0, one judge leaning Mailjet. Mailjet leads on reliability and accounts, 6.7 to 5.5 with five leans, behind a published 99.99% SLA, and on sovereignty, 7.0 to 6.0 with four leans after its pages state EU storage on Google Cloud in Frankfurt and Saint-Ghislain and a DPA with the 2021 standard contractual clauses. Deliverability and pricing transparency tie, 6.3 versus 6.3 and 5.3 versus 5.3. Weighted totals split: Brevo leads the developer and e-commerce operator, Mailjet the platform engineer, data protection officer and skeptic, and the agency lead is level at 6.3.

Choose Brevo Transactional Email if

  • You integrate by API and want a documented REST endpoint and SMTP relay with seven official SDKs — six judges lean Brevo on the sending API, zero lean Mailjet (means 7.3 to 6.2).
  • You send large batches and need batch sending up to 1,000 emails per request, part of the scored sending API detail.
  • You want a sandbox mode and idempotency keys with a 30-minute window for testing and retried sends.
  • Your team matches the developer persona (Brevo weighted total 6.3 to Mailjet's 6.2) or the e-commerce operator persona (6.2 to 6.1).
  • You weigh observability heavily — two judges lean Brevo there, means 6.2 to 5.8, with four ties.

Choose Mailjet Email API if

  • You need a published 99.99% SLA with 5% credits per thirty minutes capped at 50% of monthly fees — reliability and accounts leans Mailjet five judges to zero with one tie (means 6.7 to 5.5).
  • Your compliance review wants stated EU storage and processing on Google Cloud in Frankfurt and Saint-Ghislain and a published DPA with the 2021 standard contractual clauses — sovereignty leans Mailjet four judges to zero with two ties (7.0 to 6.0).
  • You need the stated two regions and six data centres for EU hosting described on the vendor's own pages.
  • Your team matches the platform engineer, data protection officer or skeptic persona, where Mailjet's weighted totals run 6.3 to 6, 6.3 to 6 and 6.2 to 5.5.
  • You weigh data and security highly — Mailjet's mean is 6.0 to Brevo's 5.8, with one judge leaning Mailjet and five tied.

Read this comparison as one judge. Each weighs the same scores by what they care about.

The SaaS Developer

Backend developer at a twelve-person B2B SaaS in Hamburg, built on Laravel, that sends sign-up confirmations, password resets, invoices and weekly digests to 40,000 users. Has replaced the mail driver once already and does not want to again. Wants an official driver for the framework, templates with variables, a test mode that never reaches a real inbox, signed webhooks for bounces, and a log that answers "did this user get the reset mail?" without opening a ticket.

Brevo Transactional Email

This judge's pick

Mailjet Email API

Criterion by criterion

Sending API, SMTP & developer experience

Brevo Transactional Email

This is what I'd want to wire up: a documented REST endpoint plus an SMTP relay with ports, key types and limits spelled out, official maintained libraries for PHP among seven languages, stored templates with parameters, batch sending up to 1,000 messages, attachments, scheduled sending, idempotency and a sandbox mode. The developer docs go deep — rate limits per plan, an API playground making live calls, inbound parsing of replies, and specific error codes for domain failures. What keeps it short of the top band for me: we found no public information on a Laravel-specific driver, an OpenAPI specification, or template versioning, so I'd be integrating the PHP library myself rather than dropping in a driver.

Mailjet Email API

The REST send API and SMTP relay are both documented — ports 25, 465, 587 and 2525, a 25MB per-message ceiling, libraries for PHP, Ruby, Python, C#, Java and Node, stored templates with variables, loops and conditionals, scheduled sending, and an inbound Parse API delivering parsed headers, content and attachments to a callback URL — and the developer site carries an endpoint-level API reference. What holds me back: we found no public information on a sandbox or test mode, idempotency keys, an OpenAPI specification or CLI, a vendor-maintained Laravel driver, or a migration guide from named competitors.

Deliverability & sender reputation

Brevo Transactional Email

The sending-side basics are covered: guided SPF, DKIM and DMARC with three verification routes, dedicated IPs with automated warming on higher plans, transactional and marketing mail split by stream and IP, and automatic suppression with hard-bounce pooling. There's a centralized Deliverability Center with a score, recommendations and six months of history, plus a team of deliverability experts and three specialist hours a year on Professional. We found no public information on a custom return path, feedback loops, DMARC reporting, the method behind the 99 percent claims, or a statement on the Gmail and Yahoo bulk-sender rules.

Mailjet Email API

SPF, DKIM and DMARC set-up is documented with DNS walkthroughs, dedicated IPs come with a support-built warm-up plan and per-IP volume management, CSA accreditation has been held since 2014, and deliverability experts, consulting calls and (on the top tier) blocklist monitoring are on offer. Separating transactional from marketing traffic is left to customers to arrange via sending addresses, sub-accounts or custom headers, and we found no public information on shared-IP vetting, feedback loops, Gmail and Yahoo bulk-sender compliance, or published delivery and inbox-placement figures.

Message logs, events & webhooks

Brevo Transactional Email

The question I actually ask — did this user get the reset mail — is answerable: event logs searchable by message ID, recipient or subject showing the history from API request to inbox delivery, a bounce reason in the deferred and bounce payloads, and view, filter and export of events from one logs page. Webhooks cover the full event set including soft and hard bounces and spam, are manageable by API, and there are alerts when webhook deliveries fail. The captured pages give different figures for how long logs are kept — indefinite or unlimited on feature pages, deletion at least every 24 months in the terms — and we found no public information on signed webhooks, a retry schedule, or read-only access for support staff.

Mailjet Email API

Every message gets detailed logs with status history, webhooks push open, click, bounce and block events in real time with endpoints configurable per event type by UI or API, and events can be pulled or streamed into Amazon SQS or Google Pub/Sub — enough for my bounce handling and to answer whether a given user received the reset mail. But we found no public information on webhook signatures or retry schedules, log retention, per-message bounce reasons with the server's answer, threshold-based alerts, or read-only access for support staff.

Message data, retention & security

Brevo Transactional Email

Controls I'd rely on are documented: multi-factor authentication, IP allow-listing with CIDR ranges that blocks requests even with a valid key, ISO 27001:2022, per-message tracking pixel removal and consent, and a published data processing agreement. The terms state content may be used to train Brevo's own AI features, which I'd want to nail down before pointing invoices at it. We found no public information on scoped API keys, an audit log, SOC 2, or deleting a recipient's data by API.

Mailjet Email API

Message content is stored encrypted, with AES-256 minimum at rest and TLS 1.2 or higher in transit, open and click tracking can be made anonymous or consent-based, ISO 27001, ISO 27701 and SOC 2 are claimed, there is a HackerOne bug bounty, a published DPA with standard contractual clauses, deletion within ninety days of termination, and tooling for data-subject requests. Delivery TLS can fall back to unencrypted when the recipient side cannot do TLS, and we found no public information on two-factor authentication, SSO, scoped API keys, IP allow-listing or an audit log.

Reliability, accounts & support

Brevo Transactional Email

There's a public status page, a service level agreement published as an appendix to the terms alongside 99.9 percent uptime claims, backups across three geographically distinct servers, sub-accounts on Enterprise, ten seats on Professional with phone support there, and email support even on the free plan. The integration list is real — WordPress via WP Mail SMTP, Shopify, Supabase, Zapier, Make, n8n — plus named migration paths from Klaviyo and Mailchimp. We found no public information on service credits, support response times per plan, incident history, or what happens to queued mail during an outage.

Mailjet Email API

There is a published SLA at 99.99% for the API, SMTP and outbound delivery with 5% service credits per thirty minutes of downtime capped at 50% of monthly fees, a status page for unexpected interruptions, infrastructure spread over two EU regions and six data centres, queueing so mail survives server problems, daily backups, sub-accounts from the Starter plan upward, team management with advanced permissions, and ticket support with phone hours for the Americas and APAC. We found no public information on support response times per plan or plugins for platforms that send mail on your behalf, like WordPress or Shopify.

European sovereignty

Brevo Transactional Email

For a Hamburg outfit this reads well: a French simplified joint-stock company registered in Paris with an RCS number, EU hosting claimed as France and Germany for all data, a data processing agreement with the subprocessor list inside it, and ISO 27001:2022. The privacy policy acknowledges transfers to the United States and India, and Brevo Inc. is certified under the EU-U.S. Data Privacy Framework, so parts of the chain clearly leave Europe. The captured pages give different figures for hosting — the legal notice names hosts with United States addresses — and the subprocessor list is available without the subprocessors' locations.

Mailjet Email API

The vendor's own pages state storage and processing in the EU — Google Cloud data centres in Frankfurt and Saint-Ghislain, two regions and six data centres in Europe — under a French contracting entity (Mailjet SAS, French law, Paris courts) inside the Swedish-listed Sinch group, with a published DPA incorporating the 2021 standard contractual clauses and ISO 27001/27701 certifications. Sub-processors are named — Stripe and Authorize.net for payments, Zendesk, Salesforce, Snowflake and others for support and engagement — but without their locations, and the group privacy notice describes hosting in the United States or Europe depending on where services are deployed, so I cannot call the whole chain end-to-end European.

Pricing transparency

Brevo Transactional Email

The free tier is concrete — 300 emails a day, forever, no credit card — and tiers are published with volumes, from Starter at "€7 -10% €6.33 per month" for 5,000 emails to Professional at "€499 -10% €449.08 per month" from 150,000, with a 10 percent yearly discount, pay-as-you-go credits that never expire, VAT treatment stated, and cancellation terms including a 15-day written notice on Professional. What I can't do is compute my real annual cost at 40,000 users: we found no public information on the price per additional thousand messages or what a dedicated IP costs, and Enterprise is custom price only.

Mailjet Email API

Four self-service tiers are public with volume and price — free at $0 for 6,000 emails a month (200 a day), Starter at $9/month for 8,000, Essential at $19/month and Premium at $29/month for 15,000 each — with the basis stated (emails sent, not contact count), no setup fees, a one-month rolling self-service term, prices excluding French VAT with an EU VAT-number exemption, and the clear statement that unused credits expire each month. Dedicated IPs are 'upon request' and enterprise plans are sales conversations, the pricing page points to a price per additional 1,000 emails without giving the figure on the pages we read, and we found no public information on what longer log retention, SSO or support plans cost.

Sovereignty, side by side

Dimension Brevo Transactional Email Mailjet Email API
Legal entity Not determined Not determined
Hosting location Not determined Not determined
Hosting options Not determined Not determined
Open source Not determined Not determined
Data processing agreement Not determined Not determined
Transfer impact assessment Not determined Not determined

Facts, side by side

Only facts both products carry under the same definition — anything else would not be a fair row.

Compliance · Certifications yes · yes · yes · yes1

captured 1 Nov 2026 · Report an error

yes · yes · EU-based data centers · yes · yes2

captured 1 Nov 2026 · Report an error

Compliance · DPA available yes3

captured 1 Nov 2026 · Report an error

Standard-AVV (Auftragsverarbeitungsvertrag) · yes4

captured 1 Nov 2026 · Report an error

Compliance · Dpf certification yes · EU-U.S. Data Privacy Framework · UK · Swiss · U.S. Department of Commerce3

captured 1 Nov 2026 · Report an error

yes · yes5

captured 1 Nov 2026 · Report an error

Compliance · ISO 27001 yes · ISO 27001:20226

captured 1 Nov 2026 · Report an error

yes7

captured 1 Nov 2026 · Report an error

Compliance · ISO 27001 yes · ISO 27001:2022 · yes8

captured 1 Nov 2026 · Report an error

yes · yes9

captured 1 Nov 2026 · Report an error

Hosting · Data residency France · Germany · yes1

captured 1 Nov 2026 · Report an error

EU · 2 · 69

captured 1 Nov 2026 · Report an error

Hosting · Providers Kinsta Inc · Vercel Inc.10

captured 1 Nov 2026 · Report an error

Google Cloud Platform · AWS · MacStadium · Rackspace5

captured 1 Nov 2026 · Report an error

Integrations · API languages PHP · Node · Python11

captured 1 Nov 2026 · Report an error

PHP · Ruby · Python · C# · Java · Node.js12

captured 1 Nov 2026 · Report an error

Integrations · Rest API REST API (JSON) · SMTP relay13

captured 1 Nov 2026 · Report an error

yes14

captured 1 Nov 2026 · Report an error

Integrations · Webhooks yes15

captured 1 Nov 2026 · Report an error

yes · , opens · clicks · bounce · block12

captured 1 Nov 2026 · Report an error

Pricing · Cancel anytime yes · yes16

captured 1 Nov 2026 · Report an error

yes14

captured 1 Nov 2026 · Report an error

Pricing · Free no credit card yes · no15

captured 1 Nov 2026 · Report an error

no17

captured 1 Nov 2026 · Report an error

Pricing · Free tier no · yes18

captured 1 Nov 2026 · Report an error

yes19

captured 1 Nov 2026 · Report an error

Pricing · Payment methods credit card · PayPal · direct debit (SEPA) · yes20

captured 1 Nov 2026 · Report an error

yes · yes · 5017

captured 1 Nov 2026 · Report an error

Pricing · Price change notice 30 · yes20

captured 1 Nov 2026 · Report an error

Self-service rate changes effective immediately upon Control Panel posting; contract customers at next renewal21

captured 1 Nov 2026 · Report an error

Product · Personalization yes11

captured 1 Nov 2026 · Report an error

Personalisierung direkt beim Server mit dynamischen Inhalten19

captured 1 Nov 2026 · Report an error

Product · Sender reputation Established sender reputation among Gmail, Outlook; strict control over all IP addresses15

captured 1 Nov 2026 · Report an error

yes14

captured 1 Nov 2026 · Report an error

Product · Unified platform Transactional emails and marketing campaigns managed on one platform11

captured 1 Nov 2026 · Report an error

Marketing-Kampagnen und Transaktions-E-Mails in einer Plattform19

captured 1 Nov 2026 · Report an error

Product · Uptime 99.913

captured 1 Nov 2026 · Report an error

99.919

captured 1 Nov 2026 · Report an error

Subprocessors · Payment providers Adyen · PayPal · GoCardless · Stripe · Chargebee · payment processing · PCI DSS20

captured 1 Nov 2026 · Report an error

Stripe · Chargify · Aria · Authorize.net5

captured 1 Nov 2026 · Report an error

Questions about Brevo Transactional Email and Mailjet Email API

Which is better, Brevo Transactional Email or Mailjet Email API?

As of 1 Nov 2026, the panel rates both 3/5. Weighted by what each judge cares about, 2 of the 6 judges pick Brevo Transactional Email and 3 pick Mailjet Email API, 1 calls it a tie. Which one fits depends on the criteria that matter to you; the table on this page shows both side by side, and each judge’s reading has its own page. Both were scored by the same AI bench under the same rubric, from public evidence only, as the methodology describes.

Is Brevo Transactional Email or Mailjet Email API European?

Brevo Transactional Email is European (EU-Made). Mailjet Email API is European (EU-Made). Provenance is read from each company’s own legal pages: who builds it and who owns it.

Where do Brevo Transactional Email and Mailjet Email API store customer data?

Per the vendors’ own pages as captured — Brevo Transactional Email: Default not stated; pages mention France and Germany. Mailjet Email API: Default not stated; pages mention United States, Europe and the EU.

Do Brevo Transactional Email and Mailjet Email API have a free plan?

As of 1 Nov 2026, both vendors’ own pages state a free plan. Each product page links the pricing page it was read from.