Unsubscribe Rate
Unsubscribe rate is the share of delivered messages that triggered an unsubscribe action, expressed as a percentage. Together with spam-complaint rate, it is one of two metrics that Google, Yahoo, and Microsoft monitor directly. Sustained complaint rate above 0.3 percent triggers throttling under the February 2024 bulk-sender rules.
Unsubscribe rate is a feature, not a bug. A working unsubscribe link reduces spam complaints. recipients who unsubscribe instead of marking as spam protect sender reputation. Hide the unsubscribe link and complaint rate rises, and sender reputation collapses.
What to target
- Below 0.2 percent per send: healthy. signals relevance and tight targeting.
- 0.2-0.5 percent: acceptable for cold outbound, watch for trends.
- Above 0.5 percent: targeting or message problem. fix list quality.
The 0.3 percent complaint rule
Google, Yahoo, and Microsoft's February 2024 rules for senders above 5,000 messages/day to consumer addresses require:
- One-click unsubscribe header (RFC 8058)
- Spam-complaint rate sustained under 0.3 percent
- DMARC at least `p=none` (`p=quarantine` strongly recommended)
Complaint rate is what receivers measure, not unsubscribe rate. But hiding unsubscribe to protect the rate inflates complaint rate. they are coupled.
Frequently asked questions
Are B2B 1-to-1 sends subject to bulk-sender rules?+
Not directly under the 5,000/day threshold, but the same reputation signals apply at smaller volumes. A 200-message/day cold-outbound sequence with 1 percent complaint rate will degrade sender domain reputation within weeks.
Should every cold email have unsubscribe?+
Yes. CAN-SPAM requires it for commercial messages. The legal and operational defaults align.
Put this concept into practice
Free tools, articles, and features on this same topic.
Related glossary terms
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We update these pages when the underlying mechanics change. new mailbox-provider rules, new tracker behavior, new measurement gaps. The dates above are real revisions, not auto-touches.