Open rate goes up when three things line up: the right person, the right inbox, and a subject line worth opening. If even one of the three breaks, the rate falls. Fix them in that order.
Step 1 — Land in the inbox
Authenticate your domain (SPF, DKIM, DMARC), keep complaint rate under 0.1% and avoid common spam triggers. See avoid the spam folder and avoid anti-spam filters.
Step 2 — Send to people who want it
Confirmed opt-in lists open more than scraped or bought ones. Remove inactive subscribers (no open in 6 months) so your engaged audience defines your sender reputation. Quality beats quantity every single time.
Step 3 — Win the open with the subject line
Lead with value, keep it under 50 characters, match the body. Pair it with a strong preheader. Practical guides: tips for an email subject line, subject line length, and the AI subject line generator.
Step 4 — Personalize and segment
Personalized subjects open more, but only when personalization adds information. Combine with simple segmentation (active vs. inactive, by interest tag, by city). See email personalization tips.
Step 5 — Send at the right time
- Time of day — Test 8–10 AM and lunch slots
- Day of week — Tuesday/Wednesday for B2B, weekends for B2C
- Frequency — Cut sends if open rate drops two campaigns in a row
- Cadence per subscriber — Pause sends after 3 unopened emails in a row
Measuring progress
Track the moving average of opens, not single sends. See opening rate statistics and the metric definition on opening rate.
Boost opens in three weeks
Week 1: fix authentication and clean inactives. Week 2: rewrite subject lines and add a preheader. Week 3: A/B test send time. Re-measure your open rate at the end of week 3.