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SMTP.com alternatives · Email Sending

Open-source alternatives to SMTP.com

SMTP.com 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.

SMTP.com is a paid product, starting at $25 per month for 50,000 emails. 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 SMTP.com

  1. useSend

    Open-source email sender built on Amazon SES

    • useSend starts at $10 per month, then pay as you go. SMTP.com starts at $25 per month for 50,000 emails.
    • useSend has a free plan. SMTP.com does not.
    • useSend is open source and self-hostable, according to its own site.
    • useSend also covers email campaigns.
    useSend pricing and details

  2. Plunk

    Open-source email platform for transactional and marketing mail

    • Plunk starts at $0.001 per email sent. SMTP.com starts at $25 per month for 50,000 emails.
    • Plunk has a free plan. SMTP.com does not.
    • Plunk is open source and self-hostable, according to its own site.
    • Plunk also covers workflow automation and email campaigns.
    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). SMTP.com starts at $25 per month for 50,000 emails.
    • Hyvor Relay has a free plan. SMTP.com does not.
    • Hyvor Relay is open source and self-hostable, according to its own site.
    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. SMTP.com starts at $25 per month for 50,000 emails.
    • Novu has a free plan. SMTP.com does not.
    • Novu is open source, according to its own site.
    • Novu also covers workflow automation.
    Novu pricing and details

  5. Nodemailer

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

    • Nodemailer is free. SMTP.com starts at $25 per month for 50,000 emails.
    • Nodemailer has a free plan. SMTP.com does not.
    • Nodemailer is open source, according to its own site.
    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. SMTP.com starts at $25 per month for 50,000 emails.
    • KumoMTA has a free plan. SMTP.com does not.
    • Only KumoMTA lists a Linux app.
    • Only SMTP.com lists a web app.
    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. SMTP.com starts at $25 per month for 50,000 emails.
    • Forward Email has a free plan. SMTP.com does not.
    • Only Forward Email lists macOS, Windows, Linux, iOS and Android apps.
    • Forward Email is open source and self-hostable, according to its own site.
    Forward Email pricing and details

  8. FluentSMTP

    Free WordPress plugin for sending site email through your provider

    • FluentSMTP is free. SMTP.com starts at $25 per month for 50,000 emails.
    • FluentSMTP has a free plan. SMTP.com does not.
    • FluentSMTP is open source, according to its own site.
    • FluentSMTP also covers reports.
    FluentSMTP pricing and details

Common questions

Is there an open-source alternative to SMTP.com?

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

Is SMTP.com open source?

SMTP.com 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 SMTP.com: the alternatives its listing names first, then the tools that share the most features with it.