B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
93.8%
93.8% -- inbox placement rate for Postmark (2026)
Postmark achieved a 93.8% inbox placement rate in 2026 independent deliverability tests.
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
93.8%
Unit
Percentage
Data Vintage
2026
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
founden.ai
Primary
Tier B
https://founden.ai/articles/best-email-sending-tools-for-your-platform-2026 ↗
Source Article
Best Email Sending Tools for Your Platform (2026) | Articles | Founden
The complete buyer's guide to transactional and product email infrastructure for founders and small businesses, scored, priced, and stress-tested for June 2026.
One in six legitimate emails never reaches the inbox. That is the global average from Validity's deliverability benchmark, which puts world…
Original Research
founden.ai
· Original study ↗
Methodology
Independent deliverability testing cited by Founden
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Postmark: 93.8% inbox placement rate. Source: founden.ai (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/postmark-inbox-placement-93-8
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<blockquote cite="https://lighthousedata.io/data/postmark-inbox-placement-93-8" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>93.8%</strong> -- inbox placement rate for Postmark<br><small>Source: founden.ai (2026) · <a href="https://lighthousedata.io/data/postmark-inbox-placement-93-8" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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