FAQs in this section
What is a bounce message and error code?
What are different bounce categories?
What are the different error codes?
What are the different traditional bounce codes?
What are the different enhanced bounce codes?
Can I customize the bounce messages?
I need a detailed report regarding a bounce message. How can I get it?
What is a hard bounce?
What is a general bounce?
What is a 'Mailbox full' error?
What is a 'Message too large' error?
What is a 'Mail block - relay denied' error?
What is a 'Mail block - general' error?
What is a 'Mail block - spam detected' error?
What is a transient bounce?
What is a challenge or response bounce?
What is a 'Bounce - no email address returned' error?

What is a 'DNS failure' error?

This bounce occurs when the recipient’s server is currently unable to deliver your email due to DNS issues on their end. This may or may not be a temporary problem. 
The error could be due to the mail server being down, or there was a typo when it was set up, or maybe the destination domain does not exist.
All we know is that the DNS host is unreachable. Therefore we treat this as a soft bounce and allow some time for the problem to be rectified.

To know more about Email Bounces and Error Codes, click here.
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