Validity vs Postmastery
Side-by-side from the Top 11 ranking of The 11 Best Email Deliverability Tools. Last verified June 15, 2026.
The short answer
Validity ranks higher on Top 11 (#2 vs #10) for Email marketers and developers improving inbox placement rates. The enterprise standard for reputation data, sender certification, and large-scale list verification.
At a glance
| Validity | Postmastery | |
|---|---|---|
| Top 11 rank | #2 / The 11 Best Email Deliverability Tools | #10 / The 11 Best Email Deliverability Tools |
| Score (out of 9.4) | 9 | 7.2 |
| Best for | Enterprise reputation management | Expert consultancy with software |
| Pricing | $$$$ (Custom pricing, est. >$1500/mo) | $$$$ (Custom pricing) |
| HQ | Boston, USA | Amsterdam, Netherlands |
| Founded | 2018 | 2010 |
Validity
The enterprise standard for reputation data, sender certification, and large-scale list verification.
www.validity.com/Postmastery
A specialized consultancy for complex sending infrastructures, supported by their own software.
postmastery.com/Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.