How Sendpit compares

Price, capacity model, and what your test suite can actually do. Including the rows Sendpit loses.

Sendpit compared with Mailtrap, Mailpit and MailHog
FEATURE	sendpit	mailtrap	mailpit	mailhog
How you are metered
Billed on	Stored emails, a capacity	Emails sent per month	Self-hosted	Self-hosted
Hitting the ceiling	Delete, room returns	FIFO evicts oldest, monthly counter still ticks	Prunes oldest past 500, configurable	No cap, in-memory by default
Capacity is	Pooled org-wide	Trapped per sandbox	Per instance	Per instance
Free tier	200 stored, 3 seats, 7-day retention	50/mo, 1 seat, 10 held, 1 per 10s	Free, open source	Free, open source
What your suite can do
Wait for a matching message	Server-side long poll, filters applied server-side	Poll in a loop	WebSocket firehose, filter client-side	EventSource stream, filter client-side
Mailboxes at the automatable tier	Unlimited, $10	5 at $42, 1 at $17	1 per instance	1 shared
Seats at that tier	Unlimited, $10	5 at $42, unlimited at $498	Shared basic auth	Shared inbox, multiple basic-auth credentials
Rules on arrival	100 to 500 org-wide, 5 fields, priority, match counts, scenarios	Auto-forward rules	Auto-tagging by filter	None
Extraction	Links classified, images, OTP codes via API	None	Link check	None
Webhooks	5 to 20 per mailbox, API-managed, delivery logs	Not in Sandbox plans	1 global URL, 1/sec by default, no managed delivery history	None
Show a captured email to someone with no account	Revocable expiring link, nothing sent	Re-send to a whitelisted address, capped monthly	Re-send via SMTP relay or forward	Re-send via SMTP release
SMTP message-rate throttle	None per message, connection and concurrency limits apply	Throttled per tier	No built-in per-message throttle, throughput depends on host	No built-in per-message throttle, throughput depends on host
Max SMTP message size, cheapest paid	25 MiB on every plan	7 MB at $17	50 MB by default, configurable	No documented limit
What you carry
Infrastructure	None	None	Binary, TLS certs, SQLite backups	Yours, unpatched
Transport encryption	Required on every port, trusted cert, port 25 closed	TLS	Optional, your certs	Plaintext only
Maintenance status	Active	Active	Active	Last release 2020

Competitor figures last verified on or after August 10, 2026, on monthly billing, against Mailtrap's Email Sandbox product.

// price

The same job, priced

Five environments, five people, an automated test suite that waits for messages.

TOOL	MONTHLY	MAILBOXES	SEATS	AUTOMATION
Sendpit Pro	$10	Unlimited	Unlimited	REST API, Wait API, webhooks, Smart Rules
Mailtrap Team	$42	5	5	REST API and auto-forward rules, no wait endpoint
Mailtrap Enterprise	$498	300	Unlimited	REST API and auto-forward rules, no wait endpoint
Mailpit	$0	1 per instance	Shared basic auth	REST API and one webhook, no wait endpoint

// where they win

What Sendpit does not do

If one of these is the thing you need, the tool named beside it is the better buy.

HTML client compatibility check: Mailtrap, Mailpit; Both score how an email renders across mail clients. Sendpit has no equivalent.
Certifications and procurement: Mailtrap; ISO 27001 and SOC 2 Type 2, with SSO and audit logs on their Enterprise tier.
Support hours: Mailtrap; 24/7 support with live chat from their Team tier upward.
Cheapest tier with an API: Mailtrap; API access is included on their free plan. Sendpit gates it behind Pro.
Advanced local search: Mailpit; Direct access to the local datastore, including regex search.
POP3: Mailtrap, Mailpit; Both can serve captured mail over POP3. Sendpit has no POP3 endpoint.
Unmetered use at no cost: Mailpit; Free and open source, no account, no volume ceiling beyond your own disk.