Category Archives: Postfix

Postfix is an open-source email program that was developed as an alternative to Sendmail. It is widely used in Linux and Unix operating systems as a mail transfer agent (MTA).

Postfix is known for its security features and its ability to handle high volumes of mail traffic efficiently. It can be configured to support a variety of authentication methods, including SMTP AUTH, SASL, and TLS encryption. It also has built-in spam filtering and can be integrated with other spam and virus scanning software.

One of the key benefits of Postfix is its modular architecture, which allows users to customize and extend its functionality with ease. It can be configured to work with various databases, including MySQL and PostgreSQL, and can be integrated with other applications and services through a range of plugins and interfaces.

Overall, Postfix is a reliable and flexible email program that is widely used in enterprise-level email systems and small-scale personal email services alike. Its security features, scalability, and ease of customization make it a popular choice among system administrators and email service providers.

RELEASE EMAILS FROM HOLD

Use this command to release a single email message from on hold: [code]postsuper -H 070788B31[/code]   Release all email messages from being on hold with this command: [code]postsuper -H ALL[/code]   Use the following command to release on hold messages just from user@domain.com [code]postqueue -p | awk ‘BEGIN { RS = “” } { if Read More

HOLD ALL EMAIL MESSAGES

This is the Linux command to put all Email messages on hold in Postfix. [code]postsuper -h ALL[/code] Use this command to put on hold messages from user@example.com: [code]postqueue -p | awk ‘BEGIN { RS = “” } { if (7 == “user@domain.com” ) print 1 }’ | tr -d ‘!*’ | postsuper -h[/code] CLICK HERE Read More

POSTFIX-HOLD-EMAIL-MESSAGES

To put an email message on hold use this command after you get the id number. [code]postsuper -h 070788B31[/code]   CLICK HERE to see our full Postfix Cheat Sheet using linux commands.

POSTFIX-CHECK-WHATS-GOING-ON-MAIL-LOG-POSTFIX

This is how you check what is going on in /var/log/mail.log using the Linux commands. [code]tail -f /var/log/mail.log[/code]   CLICK HERE to see our full Postfix Cheat Sheet using linux commands.

Reload-the-configuration

Postfix is a popular mail transfer agent (MTA) used by Linux servers to handle the sending and receiving of email messages. Postfix’s main configuration file is located at /etc/postfix/main.cf, and it is essential to modify this file to customize the behavior of Postfix. Postfix Reload The Configuration After modifying the main.cf or master.cf file, you Read More

Renew-queue-in-Postfix

When you want to renew the queue in Postfix you can use the following Linux command. [code]postsuper -r ALL[/code] CLICK HERE to see our full Postfix Cheat Sheet using linux commands.

Check-whole-config-of-Postfix

To check the whole config of Postfix use this linux command. [code]postconf[/code] CLICK HERE to see our full Postfix Cheat Sheet using linux commands.

Check-the-basic-config-of-postfix

This is the Linux command to use when you want to check the basic config of Postfix. [code]postconf -n[/code]   CLICK HERE to see our full Postfix Cheat Sheet using linux commands.

Flash-or-resend-the-queue-mails

Use this Linux command in Postfix to flash or resend the emails in you email queue. [code]postqueue -f[/code] CLICK HERE to see our full Postfix Cheat Sheet using linux commands.

Check-Email-Queue-POSTFIX

The following linux command will enable you to check your email queue for postfix. [code]postqueue -p[/code] CLICK HERE to see our full Postfix Cheat Sheet using linux commands.

POSTFIX-DELETE-EMAIL-MESSAGES

If you are running your own mail server you may need to delete messages. If you would like to delete them all use this command. you must be logged in as root. [code]postsuper -d ALL[/code]   The next command will let you delete all email in the queue that is from a certain domain. You Read More

POSTFIX-CHEAT-SHEET-TERMINAL-COMMANDS

Postfix is a popular open-source mail transfer agent that we use for routing and delivering email messages. It is a powerful tool that allows you to configure and manage email servers on Linux and Unix systems. However, working with Postfix requires familiarity with a number of command line tools and utilities. In this post, we Read More

The following EXIM Cheat Sheet will help you manage your EXIM 4 server. To complete these steps, it is helpful if you already are familiar with SMTP, MTA, and UNIX shell prompt. If you are having any issues with email delivery, please check out my post on DKIM, SPF and DMARC records. That post will Read More