What is a Complaint Rate? - Complaint Rate Definition
Complaint rate is the percentage of recipients who flag your emails as spam. You need to measure your complaint rate on a weekly basis. There are five main reasons for why your complaint rate may be high;
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Purchased email lists,
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Not including an unsubscribe link,
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Irrelevant content,
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Incorrect email addresses,
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Email sending frequency.
Complaint Rate Calculation:
Total Number of Complaints/Number of Emails Delivered
You can decrease your complaint rate by following the tips given below;
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Create a win-back campaign,
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Regularly remove inactive users from your list,
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Set expectations in your customers' mind,
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Maintain consistency,
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Make it easy to unsubscribe,
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Use double opt-in.
