How SMTP email testing works
— signup to first email in sixty seconds.
Create an inbox
Sign up and we generate unique SMTP credentials. No DNS setup, no domain verification, no waiting.
Point your app at us
Drop our host, port, and credentials into your environment file. Works with every SMTP-capable framework.
Inspect in real time
Send a test email. It lands in your dashboard within a second — fully parsed, scored for spam, and checked for HTML issues.
Email testing features
for engineering teams.
Drop in your credentials.
Keep shipping.
Who uses an SMTP sandbox?
Teams that treat email as production code.
Backend developers
Test welcome emails, password resets, magic links — without spamming real inboxes.
QA engineers
Assert email content in your test suite. Validate links, subjects, and rendering at scale.
DevOps teams
Spin up fresh inboxes per branch or staging environment. Catch regressions before merge.
Frontend developers
Preview email HTML across clients without setting up Litmus. See exactly what Outlook breaks.
What teams say after switching.
“We caught a Gmail rendering bug in our welcome email five minutes before launch. MailHog paid for itself on day one.”
“The spam analysis breakdown is the killer feature. We finally understand why our SaaS receipts were going to promotions.”
“Replaced our homegrown MailHog setup. Real-time updates and per-environment inboxes were what we'd been missing.”
“Our QA suite asserts on captured emails now. We caught three broken magic links before they hit prod last quarter.”