Comparison · Self-hosted vs Managed

Pony Express vs Mailchimp Transactional

Mailchimp Transactional is $20/mo (25k emails). Pony Express is a self-hosted alternative at $0.99/mo. Here's when each makes sense.

Try Pony Express Free Pony Express overview

At a glance

	Pony Express	Mailchimp Transactional
Hosting	Self-hosted, your infra	Managed SaaS (cloud only)
Data location	Your server, your disk	Mailchimp Transactional's cloud
Free tier	500 emails/mo	Paid only
Pro pricing	$0.99/mo	$20/mo (25k emails)
Dependencies	None (single binary + SQLite)	N/A (managed)
Setup time	~30 seconds	Account signup
Dashboard	Built-in at /ui	Cloud dashboard
License	BSL 1.1	Proprietary SaaS

When to use Pony Express

Pick Pony Express when you want simplicity and ownership.

Self-hosted — email logs stay on your server
$0.99/mo vs $20/mo
No per-email pricing on Pro
Single binary, no cloud dependency

Pony Express is a single Go binary with embedded SQLite. Install it with one command, and you are running in under a minute. Your data stays on your server.

curl -fsSL https://stockyard.dev/ponyexpress/install.sh | sh

Install Pony Express Pony Express docs

When Mailchimp Transactional fits better

Mailchimp Transactional makes sense when you need more.

Established deliverability reputation
Detailed analytics and A/B testing
Pre-built email templates
IP warm-up and dedicated IPs

Mailchimp Transactional (formerly Mandrill) has years of deliverability reputation and infrastructure. If email deliverability is critical to your business, a managed service with established IP reputation is the safer choice. If you send moderate volumes and want to control your email infrastructure, Pony Express is simpler and cheaper.

Deciding between the two

The pricing math between Pony Express and Mailchimp Transactional changes depending on team size. Mailchimp Transactional at $20/mo (25k emails) is reasonable for a solo user. At ten seats, the difference compounds. Pony Express is a flat $0.99/mo regardless of seats — the binary does not count how many people use it. For growing teams, this makes Pony Express progressively cheaper while Mailchimp Transactional gets progressively more expensive.

How they differ under the hood

Pony Express runs as a single static binary with an embedded SQLite database. There is no application server, no cache layer, no background worker. One process handles HTTP requests and reads from and writes to the database file directly. This simplicity is the entire point — fewer moving parts means fewer things that can break at 2 AM.

Switching from Mailchimp Transactional

Switching from Mailchimp Transactional to Pony Express is straightforward for most teams. Export your data from Mailchimp Transactional (most services offer CSV or JSON export), then POST each record to Pony Express's API. A migration script that reads the export and writes to /api/ endpoints typically takes less than 50 lines of code. The reverse migration is equally simple — Pony Express's SQLite database is a standard file you can query with any SQLite client.

FAQ

Is Pony Express a Mailchimp Transactional alternative?

Both send transactional emails (receipts, notifications, alerts). Pony Express is self-hosted. Mailchimp Transactional is managed with established deliverability.

Will emails from Pony Express land in inbox?

Deliverability depends on your server's IP reputation, SPF/DKIM setup, and sending volume. Managed services have an advantage here for high-volume senders.

Pony Express overview

Get started

Self-hosted transactional email sender in 30 seconds.

Single binary. Free to start. $0.99/mo for Pro.

Install Pony Express All 150 tools for $29/mo →