Postfix

Describes how to flush email queue from a shell prompt under UNIX / Linux operating system.

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In this tutorial yo0u will learn about Installing SSL Certificate (Secure Server Certificate) to secure communication between Postfix SMTP server and mail client such as Outlook or Thunderbird.

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Postfix is free and powerful MTA. You can easily configure Postfix to block spam. You need to add following directives to /etc/postfix/main.cf file: => disable_vrfy_command = yes : Disable the SMTP VRFY command. This stops some techniques used to harvest email addresses. => smtpd_delay_reject = yes : It allows Postfix to log recipient address information […]

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So how do you limit the mailbox size for users configured with the Postfix mail server? It is good choice to avoid problem (disk DoS) by limiting mailbox size. This will avoid the user or hacker to eat up all hard disk space. Display the default mailbox size limit Type the following command: # postconf […]

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SMTP is used to send mail. Sendmail, Qmail, Postfix, Exim etc all are used on Linux as mail server. Mail server uses the TCP port 25. Following two iptable rule allows incoming SMTP request on port 25 for server IP address 202.54.1.20 (open port 25): iptables -A INPUT -p tcp -s 0/0 –sport 1024:65535 -d […]

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