Email review,
for the people who don't run
docker compose up.
MailSandbox captures every email your test environment sends, then gives you one link to paste in a Jira ticket. Your client opens it, reviews the email, approves the copy — all without logging in, installing anything, or asking what SMTP means.
mailsandbox.com/s/8j2k-q91x-vn7p
Why not MailHog,
Mailpit, or MailTrap?
An honest answer, from someone who uses all of them. MailHog and Mailpit are excellent debug consoles — for the developer who wrote the code. They stop being useful the moment a non-engineer needs to see the email. MailTrap is built for QA teams behind a login. MailSandbox starts where both approaches stop: a link you paste in Jira, a client who clicks it, an email they approve.
|
OSS
MailHog
|
OSS
Mailpit
|
SaaS
MailTrap
|
This is us
MailSandbox
|
|
|---|---|---|---|---|
| Captures real SMTP |
Yes
|
Yes
|
Yes
|
Yes
|
| Self-hosted option |
Yes
|
Yes
|
No
|
Yes
|
| Shareable review link, no login for reviewer |
Not supported
|
Not supported
|
Login required
|
Yes — that's the point
|
| Per-developer private inboxes |
Single inbox
|
Single inbox
|
Yes
|
Yes
|
| Paid plan starts at |
Free (OSS)
|
Free (OSS)
|
~$15 / mo
|
$15 / mo
|
| Best for |
Local dev debugging
|
Local dev debugging
|
In-house QA teams
|
Agencies & stakeholder review
|
If you're a solo developer who only ever reviews your own emails, MailHog or Mailpit will serve you well — and we'll say so. If you work with clients, designers, PMs, or brand managers who need to approve email copy before it ships, that's the problem MailSandbox was built for.
Three steps.
No one needs an account.
Point your test environment at our SMTP host, copy the review link when an email comes in, paste it anywhere. That's the entire workflow. No servers to run, no client onboarding, no "just sign up for an account real quick."
Point your test env at our SMTP
Four lines in .env. Works with Laravel, Rails, Django, Node, anything that speaks SMTP. Every email your app sends now lands in MailSandbox instead of a real inbox.
MAIL_HOST=smtp.mailsandbox.com MAIL_PORT=2525 MAIL_USER=msb_a8f21c MAIL_PASS=••••••••••
Copy the review link
Every captured email gets a signed, unique URL. Drop it in a Jira ticket, a Linear comment, a Slack thread, a client email. The link renders the full HTML email with device/client preview toggles.
mailsandbox.com/s/8j2k-q91x-vn7p
Your reviewer approves
They click. They see the email exactly as it will render. They approve, request changes, or comment. You see the activity log. No signup. No Zoom call. No screenshot chain.
Ninety seconds
end-to-end.
A narrated walkthrough of the full loop — configuring SMTP in a fresh Laravel app, capturing a password-reset email, pulling the share link, and watching a reviewer open it without an account. No cuts, no narration tricks, no "edit magic."
Built for the engineer
who reads the docs.
The details the developer who configured the SMTP host actually cares about. Everything captured and indexed, everything scriptable, everything inspectable — so you can ship confidently instead of crossing your fingers.
Signed, revocable share URLs
Every share link is signed with a rotating secret, expires on a schedule you set, and can be revoked in one click. You see exactly who opened it, when, and from where.
mailsandbox.com/s/8j2k-q91x-vn7p ?expires=2026-07-12T10:00Z &sig=a8f2c1d•••••••••
Rendering preview across clients
See exactly how the email renders in Apple Mail, Outlook 2019, Gmail web, and mobile viewports before you ship. No more "it looked fine in my client."
Automated email inspection
HTML/CSS support linting, broken-link detection, image size warnings, and table-width sanity checks — run automatically on every captured email.
Spam score analysis
Coming soonSpamAssassin-compatible scoring for every captured email. Know whether your transactional template is headed for Promotions before your customers find out.
Headers, raw source, attachments
Inspect every MIME part, every header, every DKIM signature. Download the raw .eml or any attachment as if you'd pulled it out of a real mailbox.
Message-ID: <a8f2@acme.test> DKIM-Signature: v=1; a=rsa-sha256; d=acme X-Mailer: Laravel/12.4.1 Content-Type: multipart/alternative;
Per-developer private inboxes
Give each engineer a personal isolated inbox that never leaks into the team's shared view. Local testing stays local. Client-facing emails stay deliberately shared.
Priced for the team
that uses it.
Start free forever. Upgrade the day your team outgrows the tier — not the day a trial clock runs out. No credit card to try it, no retention discounts, no dark patterns.
Free
For individuals
- Emails / mo
- 500
- Inboxes
- 3
- Projects
- 1
- Team members
- 1
- SMTP capture & sandbox
- Browser-based email preview
- Team inbox access
- No credit card required
Starter
For freelancers and hobbyists
- Emails / mo
- 2,500
- Inboxes
- 20
- Projects
- 10
- Team members
- 5
- Sharing emails with signed URLs
- Automated email inspection
- Spam score analysis soon
Growth
For growing teams
- Emails / mo
- 15,000
- Inboxes
- 100
- Projects
- 50
- Team members
- 30
- Private developer inboxes
Business
For large teams
- Emails / mo
- 75,000
- Inboxes
- 300
- Projects
- 100
- Team members
- 150
Scale headroom for teams sending tens of thousands of transactional emails each month.
Start capturing test emails in
under sixty seconds.
Free tier: 500 emails per month, 3 inboxes, one shareable review link per email. No credit card, no trial clock, no "upgrade to unlock" dark patterns. Upgrade when your team outgrows it — not before.