Get the latest tutorials on SysAdmin and open source topics. Hub for Good Supporting each other to make an impact. Write for DigitalOcean You get paid, we donate to tech non-profits. By finid and Kathleen Juell. Postfix is a mail transfer agent MTA , an application used to send and receive email. In this tutorial, you will install and configure Postfix so that it can be used to send emails by local applications only — that is, those installed on the same server as Postfix. However, if you manage a cloud server on which you have installed applications that need to send email notifications, running a local, send-only SMTP server is a good alternative to using a third-party email service provider or running a full-blown SMTP server. One Debian 10 server, set up with the Debian 10 initial server setup tutorial , and a non-root user with sudo privileges. A valid domain name, like example. The output should match the name you gave the server when it was being created.
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We can send and receive email using a desktop email client. I have seen it used by facebook. Some folks might think that -all will be better as it will reject emails from untrusted hosts. To check if your SPF record is propagated to the public Internet, you can use the dig utility on your Linux box like below. On Ubuntu, you need to install the bind9-dnsutils package in order to use dig command: sudo apt install bind9-dnsutils. Append the following lines at the end of the file. The first line specifies the Postfix policy agent timeout setting. The following lines will impose a restriction on incoming emails by rejecting unauthorized email and checking SPF record. Next time, when you receive an email from a domain that has an SPF record, you can see the SPF check results in the raw email header.
Create an SPF Record in DNS
Get the latest tutorials on SysAdmin and open source topics. Hub for Good Supporting each other to make an impact. Write for DigitalOcean You get paid, we donate to tech non-profits. Following this tutorial you'll be able to add virtual domains, users, and aliases. Moreover, your virtual server will be secure from spam hub. Optional : SSL certificate setup free signed ssl certificate.
Now enter the fully qualified domain name that you want to use for send and receive emails. You can verify the Postfix version and status of the service using the following commands. Now try to check your mail server is connecting on port 25 using the following command. The above message indicates that the connection is successfully established.