Postfix - Mail Transport Agent (MTA)

Linux Tutorials - Herong's Tutorial Examples

∟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

Takeaways:

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.