Bonus material: List of 628 email SPAM trigger words [swipe file]

A hard bounce is an automated email message sent from the recipient’s email server to show that an email could not be delivered for permanent reasons. There are several reasons that an email could be a hard bounce, like: 

  • Misspelt or invalid email address
  • The domain name does not exist
  • The recipient is unknown
  • Email rejected by recipient’s strict email security filter

Email bounces are inevitable, but it’s imperative to try and keep this to a minimum as too many hard bounces imply you’ve got an unhealthy contact list which can affect your sender reputation, which ultimately affects your deliverability.



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