InboxSys
InboxSys helps senders authenticate, analyze, and improve email deliverability.
What InboxSys is
InboxSys helps senders authenticate, analyze, and improve email deliverability. Campaign tests use seedlists to show inbox placement at Gmail, Yahoo, Outlook, AOL, and other providers. Technical checks cover DMARC, SPF, DKIM, MX, alignment, and compliance, while content analysis reviews links, image URLs, text, and HTML versions with improvement suggestions. IP-reputation monitoring checks sources including SNDS, Sorbs, Spamhaus, Barracuda, Spamcop, and DNSWL. Sender allows 100 tests monthly and 15 IPs; Agency allows 2,500 tests, 500 IPs, and 10 subaccounts, adding IP grouping, trends, and PDF/CSV reports. ESP allows 25,000 tests, 5,000 IPs, and 90 subaccounts, with API access. A white-label option supports branded subaccounts on a dedicated server.
Good
- Seedlist placement tests across major providers
- DMARC, SPF, and DKIM checks
- IP reputation and blocklist monitoring
- Agency reporting with PDF/CSV exports
- REST API available on ESP
Watch out
- No free plan
- Testing and IP limits vary by plan
- White-label requires ESP plan
Who it suits
InboxSys suits email teams, agencies, ESPs, and large-volume senders monitoring placement, authentication, reputation, or multiple mailstreams. API access supports software integrations on the ESP plan.
Verdict
InboxSys covers inbox placement, authentication, content, and sender-reputation analysis across several plan levels. Match the plan’s test, IP, and subaccount limits to your sending operation.
Plans and prices
From InboxSys's own pricing page, checked 9 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Sender | €795 a year | Test limit 100 / month · IP Limit 15 · €795 yearly or €225 quarterly |
| DMARC monitor | €1,500 a year | €1.500 yearly |
| Agency | €3,495 a year | Test limit 2500 / month · IP Limit 500 · 10 Sub accounts · €3.495 yearly or €995 quarterly |
| Whitelabel | €5,000 a year | Available with ESP plan · ESP + €5.000 yearly |
| ESP | €6,795 a year | Test limit 25000 / month · IP Limit 5000 IPs · 90 Sub accounts · €6.795 yearly or €1.995 quarterly |
The facts
Each one read from InboxSys's own pages, with the date it was checked.
What it does
- API
- The ESP plan includes API access, and InboxSys says its REST API can integrate with a customer's own software.checked 9 Oct 2026
- Campaign testing
- Campaign tests use seedlists to show inbox placement at Gmail, Yahoo, Outlook, AOL, and other providers.checked 9 Oct 2026
- Content analysis
- Content analysis includes link, image URL, text, and HTML version checks, plus improvement suggestions.checked 9 Oct 2026
- Custom integrations
- InboxSys says it is open to integrating additional data sources that have an API.checked 9 Oct 2026
- DMARC monitor
- On request, InboxSys hosts a DMARC monitor using Parsedmarc, Elasticsearch, and a Kibana dashboard, with DMARC and TLSRPT reporting monitors.checked 9 Oct 2026
- IP reputation
- The service monitors IP reputation and lists SNDS, Sorbs, Spamhaus, Barracuda, Spamcop, and DNSWL among its blacklist and whitelist checks.checked 9 Oct 2026
- Purpose
- InboxSys helps users authenticate, analyze, and optimize email deliverability so messages land where they should.checked 9 Oct 2026
- Reporting
- The Agency plan includes IP grouping and trends plus PDF/CSV reports.checked 9 Oct 2026
- Security checks
- InboxSys campaign analysis checks email authentication and alignment, including SPF, DKIM, and DMARC.checked 9 Oct 2026
- Support
- InboxSys says customers can contact support to test delivery to an ISP not already on their seedlist.checked 9 Oct 2026
- Technical analysis
- The service checks DMARC, SPF, DKIM, MX, alignment, and technical compliance.checked 9 Oct 2026
- White label audience
- The white-label offering is aimed at ESPs or large-volume senders monitoring multiple mailstreams, clients, or accounts.checked 9 Oct 2026
- White label hosting
- The white-label solution can run on its own dedicated server and includes branded logos and subaccounts.checked 9 Oct 2026
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