Postfix - Mail Transport Agent (MTA)
This chapter provides introductions and tutorial examples about Postfix - Mail Transport Agent (MTA). Topics include installing, configuring, and starting Postfix; testing Postfix using STMP commands with 'telnet'; turn on 'SMTP Submission' and 'SMTPS' services; using 'postconf' command.
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What Is Postfix
Install and Configure Postfix on CentOS
Test Postfix Server with "telnet" Client
SMTP with STARTTLS on Port 25 in Postfix
"openssl s_client" Test SSL/TLS Connection
SMTP Submission Service on Port 587 in Postfix
SMTPS Service on Port 465 in Postfix
Archive Emails using "always_bcc" Setting in Postfix
Move /var/spool/postfix to New Location
"postconf" Command to Manage Postfix Configuration
Turn on Postfix Server Logging for Troubleshooting
Replace Self-Signed Root Certificate on Postfix
- Postfix is a free and open-source Mail Transport Agent (MTA) that routes and delivers electronic mails on Linux systems.
- Postfix configuration file is located at /etc/postfix/main.cf.
- Postfix accepts SMTP client requests at port 25.
- Postfix can support SMTP Submission service (SSL/TLS with STARTTLS) at port 587.
- Postfix can support SMTPS service (SSL/TLS without STARTTLS) at port 465.
- Postfix supports an "always_bcc" setting to send a blind carbon copy for archiving purpose.
- The "postconf" command can be used to manage Postfix both main.cf and master.cf configuration settings.
- You should replace the default self-signed server certificate with a new one that matches your Postfix server identity.
Table of Contents
About This Book
Introduction to Linux Systems
Cockpit - Web Portal for Administrator
Files and Directories
Users and Groups
Block Devices and Partitions
LVM (Logical Volume Manager)
SELinux - Security-Enhanced Linux
Network Connection on CentOS
Internet Networking Tools
Software Package Manager on CentOS - DNF and YUM
vsftpd - Very Secure FTP Daemon
►Postfix - Mail Transport Agent (MTA)
Dovecot - IMAP and POP3 Server
Email Client Tools - Mail User Agents (MUA)
LDAP (Lightweight Directory Access Protocol)
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