Mailtrap is a great email-testing sandbox — but it stops there, and it asks you to create an account first. MailDog gives you real SMTP credentials in one click with no signup, and when you're ready for production it also hosts email on your own domain.
Both capture test email. Only one also runs your real inbox.
| Feature | MailDog | Mailtrap |
|---|---|---|
| Free SMTP sandbox | ||
| Use without signing up | ||
| Real-time email & header inspection | ||
| Spam score analysis | ||
| Custom domain email hosting | ||
| Full SMTP & IMAP mailboxes | ||
| Automatic SPF, DKIM & DMARC |
Click once and get live SMTP credentials. No account, no credit card, no email verification before you can test.
Every sandbox is isolated and auto-deleted after 24 hours, so test data never lingers.
When testing is done, host real email on your domain with SMTP, IMAP, and automatic SPF, DKIM & DMARC.
Spin up a sandbox in one second — no signup required.
Launch Free Sandbox