Make Postfix use /etc/hosts

Posted: July 31, 2019 | Author: | Filed under: Errors, Linux, Networking, Solutions, Tips, Ubuntu | Leave a comment

To make Postfix use /etc/hosts file to find IP address of the SMTP server before it contacts any DNS servers, add two lines to the /etc/postfix/main.cf file:

  • lmtp_host_lookup = native
  • smtp_host_lookup = native

Validate your domain information

Posted: April 29, 2017 | Author: | Filed under: Networking, Solutions, Tips | Leave a comment

You may want to check if all the information available online in regard of your domain is complete and correct.

In such a case you can go to intodns.com and enter the address of your domain to verify the settings.

One thing you will often see failing is “Reverse MX A records (PTR)” for your mail server, and this is a good way to find out if everything is all right or not.

Validate SPF record online

Posted: March 27, 2017 | Author: | Filed under: Networking, Solutions, Tips | Leave a comment

If you are setting up the SPF record for your domain, you can test its validity online.