Comparison
Email testers compared
Five services that check whether your emails arrive. The table lists only information found on the providers' own websites, each with a source. As of 1 November 2026.
Postwacht is one of the services compared and wrote this page itself. “not stated” means the pages we checked say nothing about it, not that the service can't do it. Prices change; please check them with the provider before deciding.
| Postwacht | Mail-Tester | MxToolbox | GlockApps | MailGenius | |
|---|---|---|---|---|---|
| Free offering | Test by test email without an account, tools, monitoring with an account | Test by test email without an account, result available for 7 days | Free plan: blocklist monitoring weekly for 1 domain | Free plan with 2 spam test credits | Page title: “Free Email Deliverability & Spam Checker”, scope not stated |
| Paid plans (prices as shown) | none, all features currently free | USD 10 to 250 a month, for 50 to 7,500 tests, excl. VAT | USD 129 and 399 a month | USD 59, 99 and 129 a month with annual payment | USD 23, 39 and 79 a month |
| Spam and delivery test of an email | Score 0 to 10 with a fix plan | Score 0 to 10, SpamAssassin in a default installation | not stated | Spam test credits: 360, 1,080 and 1,800 per plan | 60 tests a month on Beginner, unlimited on the others |
| Analyze DMARC reports | free with an account, with a rollout assistant | DMARC report analyzer as a tool | in the paid plans | in all plans, 10,000 messages on the free plan | not stated |
| Monitor domain and blocklists | daily, up to 50 domains, free with an account | not stated | Free: weekly, 1 domain; paid plans: 5 domains | IP reputation monitors: 1 on the free plan, up to 25 on paid plans | Blocklist monitoring for unlimited domains on the USD 79 plan |
| Inbox placement | free with an account, at test mailboxes | not stated | in the paid plans, 30 or 100 analyses a month | Spam test credits (Inbox Insight) | in the test results of all plans |
| Alerts | Email, Telegram, Slack, Teams, webhook | not stated | not stated | not stated | Blocklist alerts on the USD 79 plan |
| API | on request | JSON API and iFrame in the paid plans | not stated | “API Access” in the pricing table | not stated |
| Other details from the providers | Servers in Germany, German and English | White label and custom design with an account | over 100 blocklists by its own account, BIMI management and SPF flattening in paid plans | Uptime monitors, postmaster tool seats and DMARC overage pricing depending on plan | AI consultant and copy analysis in all plans |
Sources, retrieved on 1 November 2026
- Mail-Tester: pricing and account features, FAQ
- MxToolbox: product page with plans
- GlockApps: pricing
- MailGenius: pricing, home page
- Postwacht: this offering on the same day, see pricing
In more detail
Two comparisons with more context: Postwacht and Mail-Tester and Postwacht and MxToolbox.
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