What is sender reputation and how does it affect cold email deliverability?
Sender reputation is a trust score assigned to your domain and IP by email providers, and it determines whether your cold emails land in the inbox or get buried in spam. Low reputation means your sequences never reach prospects, killing reply rates before they start. OnyxSend protects deliverability by warming domains automatically, rotating sending infrastructure across your prospect list, and flagging reputation signals before they tank your pipeline.
Evidence and detail
- Domains with poor reputation see inbox placement drop below 30%, meaning 70% of sequences never get a chance to generate replies.
- Sending more than 50 cold emails per day from a fresh domain without a warmup period typically triggers spam filters within two weeks.
- Bounce rates above 5% and spam complaint rates above 0.1% are enough for Google and Microsoft to throttle or block your sending domain entirely.
Related reading
- /blog/how-to-warm-up-a-cold-email-domain
- /blog/cold-email-deliverability-checklist-before-you-launch-sequences
- /blog/spf-dkim-dmarc-setup-guide-for-b2b-outreach
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