How to send cold emails without hurting domain reputation?
Protect your domain by sending from aged subdomains, warming them up over 4-6 weeks before hitting full volume, and capping sends at 50-100 emails per inbox per day. Use separate sending domains from your root domain. Verify every prospect address before it enters your sequence. Keep bounce rates below 3% and spam complaints below 0.1%. OnyxSend handles subdomain setup, inbox rotation, and real-time deliverability monitoring so your pipeline stays active without risking your main domain.
Evidence and detail
- Sending from warmed subdomains keeps your primary domain off blacklists even if a cold sequence triggers spam filters.
- Inbox rotation across multiple sending accounts distributes volume and prevents any single address from hitting ESP throttle limits.
- Bounce rates above 3% trigger automatic reputation penalties with Gmail and Outlook, cutting future deliverability for your entire domain.
Related reading
- /blog/cold-email-domain-warmup-guide
- /blog/inbox-rotation-strategy-for-outbound-sales
- /blog/how-to-set-up-sending-subdomains-for-cold-outreach
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