7 Best MailHog Alternatives for 2026

MailHog was the go-to local email testing tool for years — but it hasn't seen a commit since 2020. Most teams migrating away land on Mailpit, which is a solid drop-in replacement. But if you're already switching tools, it's worth asking: do you want just a local mail catcher, or a dev-to-production email workflow?

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Why look for a MailHog alternative?

MailHog still works. It captures SMTP emails and shows them in a web UI at localhost:8025. The problem is:

• Last release: 2020 — No updates in 6+ years
• Open issues piling up — 100+ issues with no response
• No modern features — No TLS, no email searching, no tagging
• Security concerns — Unpatched dependencies

If you're starting a new project — or finally replacing MailHog — there's no reason to pick an abandoned tool when better alternatives exist.

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1. SendPigeon CLI

Zero install. Same SDK from dev to production. Most email testing tools solve one problem: catching emails locally. SendPigeon CLI does that too — but it also gives you a unified workflow where your dev and production code are identical. Switch from local capture to real sending by changing one environment variable.

Install:

npx @sendpigeon-sdk/cli dev

That's it. Local SMTP on localhost:4125, web UI at localhost:4100. No Docker, no brew, no binary downloads.

Why choose SendPigeon CLI:

• Zero installation — runs via npx, nothing to set up
• Same SDK for dev and production — set SENDPIGEON_DEV=true for local capture, remove it to send real emails. No code changes.
• Cloud sandbox for CI/staging — test API keys capture emails in the dashboard, so you can test email flows in CI without a local server
• Works with any stack — SMTP server on port 4125 works with Node.js, Python, Ruby, PHP, Go, or any SMTP client
• SDKs for TypeScript, Python, Go, and PHP — first-class support across languages

# Terminal 1: start the dev server
npx @sendpigeon-sdk/cli dev

# Terminal 2: run your app — emails are caught locally
SENDPIGEON_DEV=true npm run dev

Tradeoffs:

• Requires Node.js/npx
• Newer tool, smaller community than Mailpit

Best for: Teams who want zero setup and a unified email workflow from local development to production.

Get started with SendPigeon CLI

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2. Mailpit

The direct MailHog replacement. If you just want to swap MailHog for something maintained, Mailpit is the easiest migration. It's written in Go, uses the same default ports, and has a MailHog-compatible API — so most configurations work without changes.

Install:

# macOS
brew install mailpit

# Docker
docker run -p 1025:1025 -p 8025:8025 axllent/mailpit

# Or download binary from GitHub

Why choose Mailpit:

• Drop-in MailHog replacement (same ports, compatible API)
• Actively maintained with regular releases
• Full-text search, email tagging, link checking
• HTML/plain text/source view with syntax highlighting
• Handles 100–200 emails/second over SMTP, significantly faster than MailHog

Tradeoffs:

• Requires installation (Docker, brew, or binary)
• Local only — no cloud sandbox for CI/staging
• No path to production email sending
• Still a dev-only tool — you'll need a separate service (and separate code) to send real emails

Best for: Teams replacing MailHog who want minimal migration effort and don't need a production sending path.

Mailpit on GitHub

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3. Mailtrap

Cloud-based email sandbox. Mailtrap is different from the other tools here — it's a hosted service, not a local tool. You point your SMTP config to Mailtrap's servers and emails are captured in their web dashboard.

Setup:

// Point SMTP to Mailtrap's servers
const transport = nodemailer.createTransport({
  host: "sandbox.smtp.mailtrap.io",
  port: 2525,
  auth: { user: "your_username", pass: "your_password" },
});

Why choose Mailtrap:

• No local setup needed
• Team collaboration (shared inboxes)
• Spam analysis and HTML/CSS checks
• Also offers production email sending

Tradeoffs:

• Requires internet connection
• Free sandbox plan limited to 50 test emails
• Paid sandbox plans start at $14.99/month, sending plans from $10/month
• Your email content goes through a third-party server

Best for: Teams who want cloud-based testing with collaboration features.

Mailtrap website

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4. MailCatcher

Lightweight Ruby gem. MailCatcher has been around even longer than MailHog. It's minimal, works well, and is still actively maintained.

Install:

gem install mailcatcher
mailcatcher

SMTP on localhost:1025, web UI at localhost:1080.

Why choose MailCatcher:

• Lightweight and minimal
• Still actively maintained
• Simple API for programmatic access
• Clean, straightforward UI

Tradeoffs:

• Requires Ruby installed
• Fewer features than Mailpit
• No production path

Best for: Ruby developers or teams who already have Ruby in their stack.

MailCatcher website

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5. MailCrab

Rust-based, fast. MailCrab is a newer tool written in Rust with a modern web interface built with Yew (a Rust-based frontend framework).

Install:

# Docker
docker run -p 1080:1080 -p 1025:1025 marlonb/mailcrab

# Or install via cargo
cargo install mailcrab

Why choose MailCrab:

• Very fast (Rust)
• Modern, clean UI
• Low memory usage
• Docker-friendly

Tradeoffs:

• Smaller community
• Fewer features than Mailpit
• Requires Docker or Rust toolchain

Best for: Teams who want a lightweight, fast alternative and are comfortable with Docker.

MailCrab on GitHub

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6. smtp4dev

Windows-friendly. smtp4dev runs as a .NET application with a web UI. It's been around since 2010 and is particularly popular with .NET developers.

Install:

# Docker
docker run -p 3000:80 -p 25:25 rnwood/smtp4dev

# Or install as .NET tool
dotnet tool install -g Rnwood.Smtp4dev

Why choose smtp4dev:

• Works well on Windows
• .NET native
• IMAP server included
• Long track record

Tradeoffs:

• Heavier than other options
• .NET dependency
• Desktop-style UI (less modern than Mailpit or MailCrab)

Best for: .NET developers on Windows.

smtp4dev on GitHub

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7. Ethereal

Disposable test accounts. Ethereal is different — it's a free fake SMTP service by the Nodemailer team. No installation, no local server. You get throwaway SMTP credentials and a web UI to view captured emails.

Setup:

// Create a test account
const testAccount = await nodemailer.createTestAccount();

const transport = nodemailer.createTransport({
  host: "smtp.ethereal.email",
  port: 587,
  auth: { user: testAccount.user, pass: testAccount.pass },
});

Why choose Ethereal:

• No installation at all
• Works from any language via SMTP
• Free, no account needed
• Built by the Nodemailer team

Tradeoffs:

• Requires internet connection
• Temporary accounts (emails may expire)
• No local capture
• Basic UI

Best for: Quick throwaway testing without any setup.

Ethereal website

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Quick comparison table

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Best Docker-based MailHog alternatives

If your team uses Docker for local development, these tools drop straight into your docker-compose.yml:

Mailpit — the closest drop-in replacement:

services:
  mailpit:
    image: axllent/mailpit
    ports:
      - "1025:1025" # SMTP
      - "8025:8025" # Web UI

Same ports as MailHog, so existing configs work without changes.

MailCrab — lighter footprint:

services:
  mailcrab:
    image: marlonb/mailcrab
    ports:
      - "1025:1025" # SMTP
      - "1080:1080" # Web UI

smtp4dev — includes IMAP:

services:
  smtp4dev:
    image: rnwood/smtp4dev
    ports:
      - "25:25"    # SMTP
      - "3000:80"  # Web UI

All three are actively maintained and work as direct MailHog replacements in Docker. If you don't need Docker, SendPigeon CLI runs via npx with no containers at all.

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Which should you choose?

Want zero install and a path to production? → SendPigeon CLI. One npx command for local testing, same SDK sends real emails in production. No workflow gap between dev and prod.

Replacing MailHog with minimal changes? → Mailpit. Same ports, compatible API, drop-in replacement.

Need cloud-based testing for teams? → Mailtrap. Hosted sandbox with collaboration features.

Already have Ruby? → MailCatcher. Simple, lightweight, still maintained.

Want speed and low memory? → MailCrab. Rust-based, fast, modern UI.

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FAQ

Is MailHog still maintained?

No. MailHog's last release was in 2020 and the repository has had no meaningful activity since. It still works for basic SMTP capture, but it won't receive security patches or new features.

Is Mailpit better than MailHog?

Yes. Mailpit is a direct replacement that uses the same ports and a compatible API, so switching is easy. It adds full-text search, email tagging, link checking, and is actively maintained. The only limitation is that it's still a local-only dev tool — there's no built-in path to production email sending.

What is the best drop-in replacement for MailHog?

Mailpit. It uses the same default ports (SMTP 1025, Web UI 8025) and has a MailHog-compatible API, so most configurations work without changes.

Can I use the same tool for development and production?

SendPigeon is the only option in this list that offers both local email testing and production email sending through the same SDK. Set SENDPIGEON_DEV=true for local capture, remove it for production sending.

Do I need Docker for local email testing?

No. SendPigeon CLI runs via npx with no Docker, brew, or binary downloads. MailCatcher works via a Ruby gem. Ethereal requires no installation at all (it's cloud-based). Mailpit, MailCrab, and smtp4dev all offer Docker as one install option but also have standalone binaries.

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Related

• How to Send a Test Email — Complete guide to testing your email setup
• SendPigeon vs MailHog — Detailed feature comparison
• SendPigeon vs MailCatcher — Detailed feature comparison
• Local Email Testing Guide — Full setup for SendPigeon CLI
• Email Deliverability Checklist — Make sure your emails reach the inbox