A Mailisk alternative that catches every email.
Point your app's SMTP at a Mailloop sandbox and everything it sends is captured, even mail to real-looking customer addresses on staging. Nothing reaches the recipient, and the email stays until you delete it.
- 500 emails a month, no card
- EU-hosted
- Plain SMTP, any language
- recipient that gets captured
- Any vs test domain
- how long an email stays
- Kept vs 15 days
- screenshots in email clients
- Yes vs none
- MCP sign-in for agents
- OAuth vs key
Two ways to catch test email
Mailisk gives each test an address on its own domain. Mailloop sits where your app's mail server would be. That one difference decides most of what follows.
| Test addresses How Mailisk works | SMTP capture How Mailloop works | |
|---|---|---|
| What gets caught | Mail sent to [email protected] | Everything the app sends, to any address |
| Staging with real-looking data | Mail to other addresses leaves for real | Nothing leaves the sandbox |
| Setup | Each test uses a generated address | Change the SMTP host once per environment |
| Admin and report emails | Only if you change who they go to | Captured like everything else |
| Mail from other services | Yes, to the test domain | Yes, every sandbox also has its own address |
What you can do with a captured email
Catching the email is where testing starts. This is what Mailloop adds once it lands.
Keep it until you are done
Mailloop keeps the last 200 emails per sandbox on the free plan and 1,000 on Basic, until you delete them, so QA can open Monday's email on Friday. Mailisk deletes each email after 15 days at most, and after one day on its free plan.
See it in Gmail and Outlook
Render the email in Gmail, Outlook, Apple Mail and more, light and dark, from the dashboard, the API or your agent. Mailisk shows the HTML in its dashboard only.
Trigger the next step
A webhook fires on every captured email from $12 a month, and any message can be resent to a verified real inbox on every plan.
Hand it to your agent
Claude Code, Cursor, claude.ai and ChatGPT sign in to the hosted MCP server with OAuth, create a sandbox, wait for the email and read its links. No API key in a config file.
Mailisk vs Mailloop
 Mailloop | Mailisk | |
|---|---|---|
| Capture | ||
| SMTP server for your app | Yes: Per sandbox, ports 587, 465, 25, 2525 | No: Inbound addresses only |
| Addresses on a test domain | Yes: One per sandbox, every plan | Yes: Unlimited per namespace |
| Emails kept | Yes: 200 per sandbox until deleted | Partly: Deleted after 1 to 15 days |
| Testing | ||
| Wait for an email in a test | Yes: waitFor in the SDK and API | Yes: searchInbox waits by default |
| Screenshots in email clients | Yes: Gmail, Outlook, Apple Mail and more | No: HTML in the dashboard |
| Webhooks | Yes: From $12 | No: Not documented |
| SMS and TOTP codes | No: Email only | Yes: Test numbers and TOTP |
| Price and agents | ||
| Free plan | Yes: 500 emails a month, sandbox never expires | Partly: 500 emails, namespace expires after 30 days |
| Price per email at volume | Partly: Priced per sandbox features | Yes: Much lower |
| MCP server | Yes: Hosted, OAuth | Partly: Hosted, API key in the config |
Mailisk facts checked on September 26, 2026 against mailisk.com/pricing and docs.mailisk.com. Mailloop numbers come from our pricing page.
Seen something inaccurate? Tell usWhen Mailisk is the better buy.
If your tests always choose the recipient and you mostly need a lot of short-lived mail and SMS codes, Mailisk costs less and covers more channels.
Mailisk, when
- Tests read SMS or authenticator codes
- Hundreds of thousands of emails a month
- Every test makes up its own address
Mailloop, when
- Staging sends to real-looking addresses
- QA needs the email days later
- You want to see it in Outlook and Gmail
Mailisk and Mailloop, common questions
Comparing API-first tools? See Mailloop vs MailSlurp and Mailloop vs Mailosaur.
Does Mailisk have an SMTP server my app can send to?
How long does Mailisk keep emails?
Is Mailisk cheaper than Mailloop?
Can I test SMS or authenticator codes with Mailloop?
Do both work with AI coding agents?
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