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Mailjet alternatives · Email Sending

Open-source alternatives to Mailjet

Mailjet is not described as open source on its own site. 8 of the 50 other email sending services in this directory are open source, according to their own sites.

Mailjet has a free plan. Paid plans start at $8.10 per month for 8,000 emails, billed annually ($9 billed monthly). All of them are free or have a free plan.

8 tools · Listings checked up to Nov 13, 2026 · Where the facts come from

How each one differs from Mailjet

  1. useSend

    Open-source email sender built on Amazon SES

    • useSend starts at $10 per month, then pay as you go. Mailjet starts at $8.10 per month for 8,000 emails, billed annually ($9 billed monthly).
    • useSend is open source and self-hostable, according to its own site.
    • Mailjet also covers marketing automation and email verification.
    useSend pricing and details

  2. Plunk

    Open-source email platform for transactional and marketing mail

    • Plunk starts at $0.001 per email sent. Mailjet starts at $8.10 per month for 8,000 emails, billed annually ($9 billed monthly).
    • Plunk is open source and self-hostable, according to its own site.
    • Plunk also covers workflow automation.
    • Mailjet also covers marketing automation and email verification.
    Plunk pricing and details

  3. Hyvor Relay

    Open-source email API you can self-host

    • Hyvor Relay starts at €10,000 per year and up (Enterprise License). Mailjet starts at $8.10 per month for 8,000 emails, billed annually ($9 billed monthly).
    • Hyvor Relay is open source and self-hostable, according to its own site.
    • Mailjet also covers marketing automation, email campaigns and email verification.
    Hyvor Relay pricing and details

  4. Novu

    Open-source notification infrastructure for apps and agents

    • Novu starts at $30 per month for 30,000 workflow runs. Mailjet starts at $8.10 per month for 8,000 emails, billed annually ($9 billed monthly).
    • Novu is open source, according to its own site.
    • Novu also covers workflow automation.
    • Mailjet also covers marketing automation, email campaigns and email verification.
    Novu pricing and details

  5. Nodemailer

    Free Node.js library for sending email over SMTP and other transports

    • Nodemailer is free. Mailjet starts at $8.10 per month for 8,000 emails, billed annually ($9 billed monthly).
    • Nodemailer is open source, according to its own site.
    • Mailjet also covers marketing automation, email campaigns and email verification.
    Nodemailer pricing and details

  6. KumoMTA

    Open-source mail server for high-volume, self-run email sending

    • KumoMTA starts at $5,000 per billion messages per year for Silver support. Mailjet starts at $8.10 per month for 8,000 emails, billed annually ($9 billed monthly).
    • Only KumoMTA lists a Linux app.
    • Only Mailjet lists a web app.
    • KumoMTA is open source and self-hostable, according to its own site.
    KumoMTA pricing and details

  7. Forward Email

    Open-source email forwarding and hosting for custom domains

    • Forward Email starts at $3 per month for unlimited domains. Mailjet starts at $8.10 per month for 8,000 emails, billed annually ($9 billed monthly).
    • Only Forward Email lists macOS, Windows, Linux, iOS and Android apps.
    • Forward Email is open source and self-hostable, according to its own site.
    • Mailjet also covers marketing automation, email campaigns, email verification and transactional email.
    Forward Email pricing and details

  8. FluentSMTP

    Free WordPress plugin for sending site email through your provider

    • FluentSMTP is free. Mailjet starts at $8.10 per month for 8,000 emails, billed annually ($9 billed monthly).
    • FluentSMTP is open source, according to its own site.
    • FluentSMTP also covers reports.
    • Mailjet also covers marketing automation, email campaigns and email verification.
    FluentSMTP pricing and details

Common questions

Is there an open-source alternative to Mailjet?

Yes. useSend, Plunk, Hyvor Relay, Novu, Nodemailer, KumoMTA, Forward Email and FluentSMTP are open source, according to their own sites.

Is Mailjet open source?

Mailjet is not described as open source on its own site. The listing was checked on Oct 18, 2026 against the pages it cites.

When was this checked?

Each listing shows its own date. On this page they run from Oct 18, 2026 to Nov 13, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.

This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Mailjet: the alternatives its listing names first, then the tools that share the most features with it.