Let us take a closer look and examine the error postfix error address resolver failure. At Bobcares our Server management support services will guide you through the troubleshoots.

Error: Postfix Error Address Resolver Failure

Not able to send email from the website, in Webmin we can see a mail queue with the status “address resolver failure”.

Troubleshooting Tips for Address Resolver Failure Error:

Let us take a closer look at some of the common reasons for causing the error. We will also go through some effective removal steps for the error.

• When using the Postfix mail server to send emails, the address resolver fails. This might show that the email we are trying to send is not correct.

  One approach for dealing with this error is to locate and turn off the following line:

  #sender_dependent_default_transport_maps = hash:/etc/postfix/dependent

  The line looks for things that don’t exist. Resolving it may solve the problem immediately.
• The sender map might be the cause of the address resolver failure error. In this case, we can resolve the issue by postmap it. The line given below is from the main.cf:

  sender_dependent_default_transport_maps = pcre:/etc/postfix/sdd_transport.pcre

  Here the pcre file is set correctly. We have to run this command from within the /etc/postfix directory:

  sudo postmap etc postfix sdd_transport.pcre.

  Finally, we have to restart postfix to remove the error.
• The address resolver failure error might also happen if we don’t have the following:

  mydestination = $myhostname, localhost.$mydomain $mydomain 

  in /etc/postfix/main.cf:

  Here we just removed the $myhostname and it might probably get the error removed.
• Finally, it’s good to keep a check on typos. Check for any typo in the file:

  in /etc/postfix/main.cf:

  Typos can trigger errors. We can also check to see if there is a DNS issue. Try gmail.com or hosting gmail.com from the command line.

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Conclusion

To conclude we have now gone through the error postfix error address resolver failure. The error removal tips and steps by our server management team will help us remove the error.