A hard bounce occurs when an email isn’t delivered because the receiving address is either invalid or doesn’t exist. Hard bounce is an important email metric to track because it shows, along with the soft bounce metric, how many of your emails are being delivered, and additionally, provides insight on the quality and health of your email lists.A factor that can contribute to increased hard bounces is formatting errors in the CSV files containing your contacts’ information. Review all CSV files to ensure formatting inconsistencies aren’t creating hard bounces.
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Remove email addresses that have hard bounced from your email lists. Internet Service Providers (ISPs) use bounce rates as a way to determine the credibility of the sender. Regularly sending emails that result in hard bounces can increase the likelihood that ISPs will view your emails as spam, which will make it harder for your email communications to reach your intended audience.