B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
0.1%
0.1% -- spam complaint rate benchmark for Email sending domains undergoing warm-up (2026)
During email domain warm-up, the spam complaint rate should stay below 0.1%.
- Guideline/threshold recommendation during email domain warm-up
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
0.1%
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
95
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
MailerSend
Primary
Tier A
https://www.mailersend.com/blog/domain-reputation ↗
Source Article
Why Domain Reputation is Key For High-volume Sends
IP vs. domain reputation: Why domains matter more in 2026
IP and domain reputation have long been leading factors that mailbox providers and internet service providers (ISPs) rely on for determining the trustworthiness of senders. Historically, IP reputation had the bigger sway, making it much easie…
Original Research
MailerSend
· Original study ↗
Methodology
MailerSend best-practice guidance: spam complaint rate should stay below 0.1% during domain warm-up
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Email sending domains undergoing warm-up: 0.1% spam complaint rate benchmark. Source: MailerSend (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/email-warmup-spam-complaint-rate-threshold
HTML Embed
<blockquote cite="https://lighthousedata.io/data/email-warmup-spam-complaint-rate-threshold" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>0.1%</strong> -- spam complaint rate benchmark for Email sending domains undergoing warm-up<br><small>Source: MailerSend (2026) · <a href="https://lighthousedata.io/data/email-warmup-spam-complaint-rate-threshold" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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