For developers building marketing and transactional email flows, Mailjet is an email-sending API, owned by Sinch, that handles delivery infrastructure for high-volume senders like Microsoft and DHL.
Presence & Market Position
Tracked · below panel floor — earned mentions are accruing toward the next scored window.
Measures earned, engagement-weighted share of voice across the GTM voices panel. Methodology →
Mailjet positions itself as the email platform built for developers and marketers at once: API and SMTP relay for engineering teams, a drag-and-drop editor for campaign teams, run inside Sinch's cloud communications portfolio alongside Mailgun and Email on Acid. That dual-audience framing extends to its customer base, which spans large-scale senders like Microsoft, DHL, and Wikipedia running both marketing and transactional volume. In the conversation the Index tracks, Mailjet's presence reads early rather than absent, a known name in the email-API category that hasn't yet become a subject of active practitioner debate or comparison.
MailerSend
SparkPost
AssemblyAI
Deepgram
Netcore Email APIMicrosoft, American Express, DHL, Wikipedia, Red Hat, NHL, Universal Music Group, Siemens, Urban Outfitters
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Business Profile
Mailjet launched in 2010 in Nantes, France, as a standalone email marketing and API platform and built a customer roster that came to include Microsoft, DHL, and American Express. Mailgun acquired the company in 2019, and that combined entity, Pathwire, was later acquired by Sinch in 2021. Mailjet now operates as one of three email brands, alongside Mailgun and Email on Acid, inside Sinch's cloud communications portfolio. At 47 employees, it runs today as a focused product line inside a larger parent rather than a standalone growth-stage business.
Agent Readiness
Measures how easily your agents can build on it — API, MCP, CLI, SDK, docs depth. Methodology →
Mailjet has built out both AI-assisted authoring and agent-facing infrastructure: an AI email generator and in-editor assistant for campaign creation, an AI segmentation tool that translates plain-language requests into audience filters, and a Model Context Protocol server that lets tools like Claude Desktop query campaign analytics in natural language. These sit alongside its existing API and SDK surfaces for developers.
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