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MailerSend alternatives · Email Sending

Open-source alternatives to MailerSend

MailerSend 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.

MailerSend has a free plan. Paid plans start at $6.30 per month for 5,000 emails, billed annually ($7 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 MailerSend

  1. useSend

    Open-source email sender built on Amazon SES

    • useSend starts at $10 per month, then pay as you go. MailerSend starts at $6.30 per month for 5,000 emails, billed annually ($7 billed monthly).
    • useSend is open source and self-hostable, according to its own site.
    • useSend also covers email campaigns.
    • MailerSend also covers business texting, whatsApp messaging, email verification and dMARC.
    useSend pricing and details

  2. Plunk

    Open-source email platform for transactional and marketing mail

    • Plunk starts at $0.001 per email sent. MailerSend starts at $6.30 per month for 5,000 emails, billed annually ($7 billed monthly).
    • Plunk is open source and self-hostable, according to its own site.
    • Plunk also covers workflow automation and email campaigns.
    • MailerSend also covers business texting, whatsApp messaging, email verification and dMARC.
    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). MailerSend starts at $6.30 per month for 5,000 emails, billed annually ($7 billed monthly).
    • Hyvor Relay is open source and self-hostable, according to its own site.
    • MailerSend also covers business texting, whatsApp messaging, email verification and dMARC.
    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. MailerSend starts at $6.30 per month for 5,000 emails, billed annually ($7 billed monthly).
    • Novu is open source, according to its own site.
    • Novu also covers workflow automation.
    • MailerSend also covers business texting, whatsApp messaging, email verification and dMARC.
    Novu pricing and details

  5. Nodemailer

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

    • Nodemailer is free. MailerSend starts at $6.30 per month for 5,000 emails, billed annually ($7 billed monthly).
    • Nodemailer is open source, according to its own site.
    • MailerSend also covers business texting, whatsApp messaging, email verification and dMARC.
    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. MailerSend starts at $6.30 per month for 5,000 emails, billed annually ($7 billed monthly).
    • Only KumoMTA lists a Linux app.
    • Only MailerSend 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. MailerSend starts at $6.30 per month for 5,000 emails, billed annually ($7 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.
    • MailerSend also covers business texting, whatsApp messaging, email verification, dMARC and transactional email.
    Forward Email pricing and details

  8. FluentSMTP

    Free WordPress plugin for sending site email through your provider

    • FluentSMTP is free. MailerSend starts at $6.30 per month for 5,000 emails, billed annually ($7 billed monthly).
    • FluentSMTP is open source, according to its own site.
    • FluentSMTP also covers reports.
    • MailerSend also covers business texting, whatsApp messaging, email verification and dMARC.
    FluentSMTP pricing and details

Common questions

Is there an open-source alternative to MailerSend?

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

Is MailerSend open source?

MailerSend is not described as open source on its own site. The listing was checked on Nov 9, 2026 against the pages it cites.

When was this checked?

Each listing shows its own date. On this page they run from Nov 9, 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 MailerSend: the alternatives its listing names first, then the tools that share the most features with it.