Comparison
Zyntra vs Mailosaur
Mailosaur is a broad testing suite: email, SMS, email previews and enterprise controls. Zyntra does one thing, receiving test email and handing it to a test, a person or an AI agent, and starts free.
Side by side
Mailosaur facts are from its own website, checked on October 16, 2026. Prices change; check the sources below before you decide.
ZyntraMailosaur
Free plan$0: 150 emails/month, 500 API requests/monthNo free plan; 14-day trial on Personal
Entry paid planStarter: $9/month billed yearly, $11 monthly; 10,000 emails/monthPersonal: from $20/month billed yearly; 15,000 emails/month, 500/day
Next planPro: $29/month billed yearly, $39 monthly; 50,000 emails/monthCore: from $50/month billed yearly; 75,000 emails/month, 2,500/day
InboxesAny number of addresses; inboxes created in the dashboard are listed in the viewerPersonal: 1 inbox with unlimited addresses; Core: multiple inboxes
Address
{teamId}.{anytext}@zyntramail.comanything@{inbox}.mailosaur.netMail kept1 day for addresses you never created; 7 / 30 / 90 days for inboxes created in the dashboard (Free / Starter / Pro)Not stated on the pricing page
SMS testingNoAdd-on on Core
Email previews in mail clientsNoAdd-on on Core
AI agentsHosted MCP server: 5 tools, read and delete onlyNo MCP server from Mailosaur found; community-built servers exist
Users, SSO, SLAMulti-user teams, SSO and SLA are not offered1–3 users on Personal, 5 on Core; SSO and SLA on Enterprise
Which one fits
Choose Mailosaur if
- You test SMS or authenticator codes as well as email.
- You need to see how an email renders in Outlook, Gmail and other clients.
- Several people need their own logins, or you need SSO and an SLA.
Choose Zyntra if
- You want to start free: 150 emails a month, no trial clock.
- Your volume fits 10,000 emails a month for $9–11.
- An AI agent should read test email through MCP, with no way to send.
- People on your team read test mail in a browser and keep it for weeks.
Questions
- Can I keep my test code structure?
- Mostly. Both work by sending to a generated address and reading it back over HTTP. Replace the address builder and the read call; the email verification guide has a small helper to start from.
- Does Zyntra check spam scores or render previews?
- No. It receives mail and hands it to your test, a person or an agent. It does not score or render it.