How to avoid spam filters when sending cold outreach emails?

Warm your sending domain for 3-4 weeks before launching sequences, keep daily send volume under 50 emails per inbox until reputation is established, and personalize every first line so spam classifiers see human variance, not blasts. Use a custom tracking domain, strip heavy HTML, and rotate across 3-5 sending addresses when hitting 500+ prospects per month. OnyxSend handles domain health monitoring, sequence throttling, and deliverability scoring automatically so your pipeline keeps moving and qualified meetings keep booking.

Talk to the team