How to improve cold email deliverability?
Warm up dedicated sending domains for 3-4 weeks before touching any prospect list, then cap volume at 40-50 emails per inbox per day. Authenticate every domain with SPF, DKIM, and DMARC records before sending a single sequence. Scrub your list down to verified contacts, keep bounce rates under 2%, and rotate copy across variants so inbox providers don't pattern-match your sequences. Teams running 500-2,000 prospects per month this way consistently hit 85-95% inbox placement and 3-6x more qualified meetings booked.
Evidence and detail
- Proper domain warm-up and authentication reduce spam folder placement by up to 90% versus cold sending on fresh domains.
- Lists scrubbed to under 2% bounce rate generate reply rates of 8-15%, compared to 1-3% on unverified lists.
- Rotating message variants across 3-5 sequence steps cuts spam filter triggers and lifts deliverability scores on major ESPs.
Related reading
- /blog/cold-email-domain-warmup-guide
- /blog/spf-dkim-dmarc-setup-for-outreach
- /blog/how-to-clean-your-prospect-list-before-sequences
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