Term of the Week: Hard Bounce

1 minute read

Upland Admin

Bounces are the total number of recipients who didn’t receive the attempted send. We have talked about Soft Bounces before in Term of the Week but they aren’t the only kind. Today we’ll explain hard bounces.

What is a Hard Bounce?

A hard bounce is an email that wasn’t delivered because the recipient’s email address is invalid. This could happen because:

  • The email address doesn’t exist
  • The domain name used doesn’t exist
  • The recipient email server has blocked delivery

There are occasions when a valid email can be hard bounced too, though rare. This might be because your email was denied by a firewall or filter, which would suggest an issue with your content. However it could be that an ISP is blocking your emails after spam complaints on you ESP’s server.

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