![]() Postfix is a widely used and well documented MTA. With the most current version of CentOS, Postfix has superseded Sendmail as the default MTA. ![]() However, of the author's humble opinion, Postfix hits a sweet spot when addressing the following notes for an MTA. The default MTA installed in the older versions of CentOS is Sendmail. With its combined focus on both security and the ease of administration, we have chosen Postfix as the MTA for this tutorial. Do not use this tutorial for MTA configuration of an Internet facing host. ![]() In short, this tutorial is meant to familiarize you with the basic configuration. This is a combination of many skills including but not limited to: DNS, getting a static routable IP address that is not blacklisted, and configuring advanced security and service settings. We do not go into detail about advanced configuration for setting up an MTA for business operations. It is worth noting, this tutorial only teaches the process of setting up the daemon for local use. Mail Transfer Agent is the daemon responsible for sending outbound mail for system users or corporate Internet Domains via SMTP. In order to send an email from our CentOS 7 server, we will need the setup to configure a modern Mail Transfer Agent (MTA).
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