Mailgun and Mailjet are tools that deliver the email a business sends, built for engineering teams and marketers. Mailgun is made for developers who push application mail through code and want paid add-ons that watch deliverability and check addresses. It suits engineering teams. Mailjet is made for teams that run newsletters and app mail from one login, so it suits marketers and agencies.
Pricing: Free for 100 emails/day; Send from $15/mo for 10,000 emails; Optimize add-on from $49/mo; Inspect add-on from $99/mo. Billed monthly only.
Mailgun is a transactional email API and SMTP relay for developers, with paid add-ons for deliverability monitoring, pre-send QA and email validation.
Pricing: Free up to 6,000 emails/mo; Essential from $17/mo (15,000 emails) to $37/mo (50,000); Premium from $27/mo (15,000 emails) to $250/mo (250,000).
Mailjet is email marketing and a transactional email API on one platform from Sinch, with a drag-and-drop editor, SMTP and REST sending and EU-hosted data.
Transactional Email Services features side-by-side
Free for 100 emails/day; Send from $15/mo for 10,000 emails; Optimize add-on from $49/mo; Inspect add-on from $99/mo. Billed monthly only.
Free up to 6,000 emails/mo; Essential from $17/mo (15,000 emails) to $37/mo (50,000); Premium from $27/mo (15,000 emails) to $250/mo (250,000).
Choose Mailgun if you write code and want blocklist monitoring and address checks in the same account as your app mail. Choose Mailjet if you want campaigns and app mail under one login. Both products belong to Sinch. Mailgun has a free plan and monthly paid plans. Mailjet also has a free plan, with monthly paid plans and higher plans sold by quote.
A new dedicated IP gets its sending volume raised automatically over days, which takes the warm-up schedule off the developers. Mailgun also queues a message for later when the API call carries a send time. Paid add-ons cover blocklist monitoring, DMARC report analytics and checking addresses in bulk or in real time. Newsletters with a drag-and-drop builder are left to Mailjet, so campaign work sits in a second product.
Marketers and agencies get the most from Mailjet, which puts a drag-and-drop editor and a signup form builder beside its sending API. Teammates can comment on a draft next to the live preview. The editor also offers AI help with writing email copy. Automation workflows arrive only on a higher plan, so teams that want triggered sequences must move up.
Mailgun's users praise fast support, even on the free plan, and simple integration. They complain about accounts or domains that are disabled or locked with little explanation, and about slow or unhelpful support on setup or account problems. Mailjet's reviewers like a builder that a non-technical team picks up quickly, a usable free tier, and helpful agents in individual ticket threads. They report accounts blocked or capped with no warning, slow support on serious problems and limited template flexibility.
Mailgun tells of an ecommerce marketing platform that runs email delivery and domain verification at scale on the service. That platform no longer needs a separate email flow to verify domains, and nearly all of that mail is delivered. Mailjet's story is about a dating app for phones, used in many countries, that handles account and onboarding emails along with multilingual newsletters and localized campaigns. The app says message design and organization take a few clicks while keeping a coherent look.
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