A hard bounce refers to an email that is returned to the sender because the recipient's address is invalid or there is a permanent delivery issue. This can negatively impact sender reputation and deliverability rates, making it crucial for marketers to regularly clean their email lists.

Hard Bounce

hard bounce

Email returned to sender

recipient's address

permanent delivery issue

Sender reputation is a crucial metric used by email service providers to evaluate the trustworthiness of a sender's email address or domain, impacting the deliverability of emails to recipients' inboxes. It is influenced by factors such as email engagement rates, complaint rates, and the frequency of sending emails, and maintaining a high sender reputation is essential for successful email marketing campaigns.

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