Email bounce rate represents the percentage of emails that were sent but not delivered. In addition to showing how many of your sent emails did not make it to your intended recipients, your email bounce rate can help provide insight into the overall health of your email list.
It is important to note, there are two kinds of email bounces. Soft bounces are a temporary problem with a valid email address. Hard bounces are the result of an invalid or non existent email address.
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To determine your bounce rate, divide the number of bounced emails by the number of emails sent.
Emails coming from addresses associated with free email service providers like Gmail or Yahoo are more likely to get caught in email spam filters. Use email addresses associated with a private domain, like your website, to ensure more of your emails are delivered.