Mail-Tester checks your headers. InbXr watches your entire list.
Considering Mail-Tester? Here's what it covers, what it misses, and where the Signal Engine reads the rest of your list.
What Mail-Tester is
Mail-Tester gives you a spam score out of 10 by analyzing a single email you send to a test address. It reads SPF, DKIM, DMARC, message content, and a few content-based spam rules, then tells you whether that one email would hit the inbox. Simple, free, useful for setup verification.
What Mail-Tester does well
- SPF, DKIM, and DMARC header inspection
- Spam score computation from content
- Clear, single-page verdict
- Free for quick one-off checks
Signal coverage
InbXr reads 7 Inbox Signals across 100 weighted points. Mail-Tester covers:
Signal 06 · Authentication Standing (partial)
What Mail-Tester doesn't read
- Signal 01 · Bounce Exposure (no list verification)
- Signal 02 · Engagement Trajectory (no MPP detection)
- Signal 03 · Acquisition Quality (no cohort reading)
- Signal 04 · Domain Reputation (no DNSBL continuous monitoring)
- Signal 05 · Spam Trap Exposure (no dormancy reading)
- Signal 07 · Decay Velocity (no score history)
Side by side
| Capability | Mail-Tester | InbXr |
|---|---|---|
| SPF/DKIM/DMARC header check | ✓ | ✓ |
| Content-based spam score | ✓ | × |
| Continuous authentication monitoring | × | ✓ |
| List-level bounce prediction | × | ✓ |
| MPP-adjusted engagement reading | × | ✓ |
| Blacklist monitoring | × | ✓ |
| List cohort and trajectory analysis | × | ✓ |
| Pre-send status check (green/amber/red) | × | ✓ |
| Recovery Sequence copy generation | × | ✓ |
When Mail-Tester is enough
If you're setting up a new sending domain and want to verify your auth records are configured before the first send, Mail-Tester gets you to green quickly.
When you need InbXr instead
If you're already sending and want to know what your list is actually broadcasting beyond the headers, authentication is only 5 of the 100 points. InbXr reads the other 95.
Get your 7 Signal reading in 30 seconds
Type your sending domain. See the 2 signals the Signal Engine can read from DNS alone. Sign up to unlock the other 5.
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