Do I have to change my app's SMTP settings for Zyntra?

No. Your app keeps its normal provider. Only the recipient changes: the test signs up with a Zyntra address.

Does Zyntra check HTML or spam scores like Mailtrap?

No. Zyntra gives you the email as it arrived: HTML, text, headers, links and attachments. It does not score it.

Comparison

Zyntra vs Mailtrap Email Sandbox

They test different things. Mailtrap's sandbox stands in for your mail server: your app sends to it and the email never reaches anyone. Zyntra is where the email arrives: your app sends through its real provider to a Zyntra address, so the test covers delivery too.

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Side by side

Mailtrap Email Sandbox facts are from its own website, checked on October 16, 2026. Prices change; check the sources below before you decide.

ZyntraMailtrap Email Sandbox

How mail gets inYour app sends normally, through its own provider, to a zyntramail.com addressYour app sends to the sandbox instead of a real server; mail is captured and not delivered

Tests delivery through your providerYesNo, the sandbox replaces the delivery step

Free plan$0: 150 emails/month, 500 API requests/month$0: 50 test emails/month, 1 sandbox, 10 emails kept per sandbox

Entry paid planStarter: $9/month billed yearly, $11 monthly; 10,000 emails/monthBasic: $14/month billed yearly, $17 monthly; 500 test emails/month

Larger planPro: $29/month billed yearly, $39 monthly; 50,000 emails/monthBusiness: $99/month billed yearly, $123 monthly; 50,000 test emails/month

Mail kept1 day for addresses you never created; 7 / 30 / 90 days for inboxes created in the dashboard (Free / Starter / Pro)Oldest mail removed when a sandbox is full (10 to 1,000 emails per sandbox by plan)

AddressesAny number, no setupEach sandbox has one address on paid plans

AI agentsHosted MCP server: 5 tools, read and delete onlyOfficial MCP server, which can also send email

UsersMulti-user teams are not offered1 on Free, up to 50 on Business

Which one fits

Choose Mailtrap Email Sandbox if

Staging must never deliver a real email, and you want to inspect what would have been sent.
Your app can point its SMTP settings at a test server per environment.
Several people need their own logins.

Choose Zyntra if

You want to know the email really arrives when your app sends it the normal way.
Each test needs its own address without creating anything first.
You send more than a few hundred test emails a month: Starter covers 10,000.
An AI agent should read test email but never be able to send.

Can I use both?

Yes, and some teams do: a sandbox on local machines and in early CI, where nothing should leave the network, and Zyntra on staging, where the point is to check the email your users will get. The two answer different questions.

Questions

Do I have to change my app's SMTP settings for Zyntra?: No. Your app keeps its normal provider. Only the recipient changes: the test signs up with a Zyntra address.
Does Zyntra check HTML or spam scores like Mailtrap?: No. Zyntra gives you the email as it arrived: HTML, text, headers, links and attachments. It does not score it.

Sources

Test the email your users actually get

Free plan. Send to any address and read it back over the API.

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