B Evidence Grade B Graded accuracy verified by the review judge Safe to Cite Current

15%

15% -- inbox placement rate difference for cold email mailboxes warmed fewer than 14 days (2026)

Name: Inbox Placement Rate Difference Statistics
Creator: Lighthouse Intelligence
Published: 2026-10-02

2026 · AstraGTM

Mailboxes warmed for fewer than 14 days experience 15% to 20% lower inbox placement rates during their first month of active sending.

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Attribution: AstraGTM View source

Lighthouse Research Team

Last verified: 2026-10-02 · How we verify data →

Source verified Evidence graded

Value

15%

Unit

Percentage

Data Vintage

2026

Entity

cold email mailboxes warmed fewer than 14 days

Evidence Quality

Strong, reliable evidence

Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.

61/100 confidence

Single source - not yet corroborated

Score breakdown

Extraction

Source Trust

Citation Chain

Independence

Methodology

Freshness

Source

AstraGTM Primary Tier B

https://astragtm.io/guides/cold-email-timeline-expectations ↗

Confidence: 53/100 Vintage: 2026 Channel: Common Crawl

Source Article

The Cold Email Timeline: What to Expect in Months 1, 2, and 3

Original Research

AstraGTM · Original study ↗

Methodology

Vendor first-party data; range 15-20%, midpoint used

Methodology documented

Segmentation

IndustryB2B RoleAll marketers Channelemail

Cite this stat

Plain Text

cold email mailboxes warmed fewer than 14 days: 15% inbox placement rate difference. Source: AstraGTM (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/short-warmup-inbox-placement-penalty

HTML Embed

<blockquote cite="https://lighthousedata.io/data/short-warmup-inbox-placement-penalty" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>15%</strong> -- inbox placement rate difference for cold email mailboxes warmed fewer than 14 days<br><small>Source: AstraGTM (2026) · <a href="https://lighthousedata.io/data/short-warmup-inbox-placement-penalty" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>

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