- You want to know where mail actually lands. Unspam delivers to real seed inboxes at Gmail, Outlook, Yahoo, Zoho, ProtonMail, AOL and GMX and reports inbox vs spam for each. Mailtrap's Email Sandbox captures messages in a fake inbox and simulates checks; its own guides point you to third-party seed-list tools for real placement.
- You want client previews and an AI eye-tracking heatmap alongside spam scoring, in one plan from $5/mo. Mailtrap renders client screenshots too, but only as a paid add-on you request from support on its Business and Enterprise Sandbox plans, from $99/mo billed annually, and it has no heatmap and no AI assistant.
- You want one subscription for testing. Mailtrap sells Email Sandbox, Email API/SMTP and Email Marketing as separate products, each billed separately, so you may pay for more than one; Unspam's spam tests, placement, previews and heatmaps are in a single plan.
- You want a free tier that renews monthly (5 spam tests, 3 inbox placements, 3 device previews, 5 screenshots and 5 heatmaps, AI assistant included, no card) with a 14-day no-questions refund on paid plans.
A Mailtrap alternative that tests real inbox placement, outside the sandbox
Mailtrap is a developer email platform with three product lines: an Email Sandbox that captures test emails in a fake inbox for spam, blacklist and HTML checks, an Email API/SMTP service for real sending, and an Email Marketing product for campaigns. Unspam isn't a sandbox or a sending platform. It delivers test emails to real seed inboxes at 7 providers and adds client previews and AI heatmaps, free to start, paid from $5/mo.
Compared from public pricing and product pages, September 2026.
Which one fits you?
- You're a developer who needs to capture outgoing emails from a staging or QA app in a fake SMTP inbox before anything reaches real users. That sandbox workflow is Mailtrap's core strength, and Unspam doesn't do it.
- You need an actual sending platform. Mailtrap's Email API/SMTP sends production email with logs and analytics (free up to 4,000 emails/mo); Unspam is a testing tool and sends nothing on your behalf.
- You want self-serve API access on a free or low tier. Mailtrap's API is central to the product; Unspam's API is gated behind the Custom plan.
Why teams move from Mailtrap to Unspam.
A sandbox is a simulation, not placement
Mailtrap's Email Sandbox captures your test email in a fake SMTP inbox and runs spam, authentication and HTML checks against it. It does not deliver to real mailbox providers, and Mailtrap's own guides point users to third-party seed-list tools for real-world inbox placement. Unspam sends to live seed inboxes at Gmail, Outlook, Yahoo, Zoho, ProtonMail, AOL and GMX and reports inbox vs spam for each, in about 30 seconds.
A heatmap and AI on top of the preview
Mailtrap previews HTML across clients in its sandbox, which is genuinely useful, but it has no attention heatmap and no AI assistant to explain fixes. Unspam includes device and client previews, an AI eye-tracking heatmap and an AI assistant on every plan, including the free one.
One subscription, not two products
Mailtrap splits testing (Email Sandbox) and sending (Email API/SMTP) into separate, separately billed products. Unspam bundles spam testing, inbox placement, previews, heatmaps and blacklist checks into a single plan from $5/mo, with a 14-day no-questions-asked refund and 15% off annual billing.
Unspam vs Mailtrap, feature by feature.
Based on public product pages and documentation. Spotted something outdated? Tell us in the chat and we'll fix it.
Feature
Unspam
Mailtrap
Free plan or trial
Free plan, no card
Free: 50 sandbox test emails/mo
First paid plan
$5/mo minimum, usage-priced
$14/mo billed annually (Email Sandbox Basic)
Spam score testing
Yes
Yes
Inbox placement tests
Yes
Nosandbox simulation, not real seeds
Client previews & screenshots
Yes50+ clients, light & dark
Partialclient screenshots, paid add-on on Business/Enterprise
AI attention heatmap
Yes
No
Blacklist monitoring
Partialon-demand checker
Partialper-test blocklist check
SPF / DKIM / DMARC checks
Yes
Yes
AI fix recommendations
Yes
No
Scheduled automatic tests
Yesplacement + spam score
No
Scheduled spam score tests
Yesdaily, weekly, or monthly
NoSpamAssassin score per message, no scheduler
Sender accounts
YesUnlimited
No
API access
YesCustom plan
Yes
MCP server
YesCustom plan
YesOfficial server for sending and sandbox
Email verification
Yes
No
Automated inbox warmup
No
No
DMARC report monitoring
YesCustom plan, first domain free
Partialvalidated per test
Deliverability consulting
Yesseparate service
PartialBusiness/Enterprise sending plans
Compared from public pricing and product pages, September 2026.
What each one costs.
Email Sandbox (testing) and Email API/SMTP (sending) are separate products billed separately; you may need both. Sandbox annual billing saves up to ~20%. The figures here are the lowest-volume tiers; higher volumes cost more.
- Free $0
5 spam tests, 3 inbox placements, 3 device previews, 5 screenshots, 5 heatmaps per month. AI assistant included.
- Custom $5/mo
Pay per test: spam tests $0.18, inbox placements $0.50, device previews $0.75, screenshots $0.20, heatmaps $0.30. Volume discounts to 30%, 15% off annual, $5 monthly minimum. API, MCP and three years of history included. DMARC monitoring is $6 per domain per month, first domain free.
- Email Sandbox Free $0
50 test emails/month, 1 sandbox, 10 emails per sandbox, 1 user; spam score, blacklist and HTML checks
- Email Sandbox Basic $14/mo billed annually ($17 monthly)
500 test emails/month, 1 sandbox, 50 emails per sandbox, 3 users, 100 forwarded emails/month
- Email Sandbox Team $34/mo billed annually ($42 monthly)
5,000 test emails/month, 5 sandboxes, 200 emails per sandbox, 5 users
- Email Sandbox Business $99/mo billed annually ($123 monthly)
50,000 test emails/month, 50 sandboxes, 600 emails per sandbox, 50 users, 2,000 forwarded emails/month
- Email API/SMTP Free $0
4,000 emails/month real sending, 150/day, 1 domain, 1 user, 3-day log retention. Separate product from Email Sandbox.
- Email API/SMTP Basic From $15/mo
From 10,000 emails/month, 5 domains, 3 users, 5-day log retention, no dedicated IP. Usage-based; scales to Business and Enterprise.
Every Mailtrap plan and price in full
Compared from public pricing and product pages, September 2026. Mailtrap is a trademark of its respective owner. Unspam is not affiliated with or endorsed by Mailtrap.
Unspam vs Mailtrap, answered.
Is Unspam a full replacement for Mailtrap?
It depends what you use Mailtrap for. For pre-send deliverability testing, Unspam goes further: it adds real-seed inbox placement across 7 providers, an AI heatmap and an AI assistant on top of spam scoring and previews. But it does not replace Mailtrap's developer sandbox (capturing app emails in a fake SMTP inbox) or its Email API for production sending. Unspam is a testing tool and sends no mail on your behalf.
How does the pricing compare?
Mailtrap bills Email Sandbox and Email API/SMTP separately: Sandbox is free for 50 test emails/month, then $14/mo billed annually for Basic; the sending API is free up to 4,000 emails/month, then from $15/mo. Unspam is one subscription, free to start and paid from $5/mo, with a 14-day refund and 15% off annual billing.
What is the biggest functional difference?
Simulation versus real placement. Mailtrap's sandbox captures a message in a fake inbox and simulates spam, auth and HTML checks so developers can debug before sending; it does not deliver to real providers. Unspam delivers test emails to live seed inboxes and reports where each one lands, then adds client previews and an AI eye-tracking heatmap. Neither tool offers inbox warmup, and DMARC aggregate-report monitoring is Unspam only, on the Custom plan. Simulation and real seed delivery are both sold as testing, and which tools use real seed mailboxes is the line that separates them.
How do the free tiers compare?
Mailtrap's Email Sandbox free tier allows 50 test emails a month in one sandbox, and its sending API free tier allows 4,000 emails a month. Unspam's free plan renews monthly with 5 spam tests, 3 inbox placements, 3 device previews, 5 screenshots and 5 heatmaps, with the AI assistant included and no credit card required.