Mail server

tail is one of the best tool to view log files in a real time (tail -f /path/to/log.file). The program MultiTail lets you view one or multiple files like the original tail program. The difference is that it creates multiple windows on your console (with ncurses). This is one of those dream come true program for UNIX sys admin job. You can browse through several log files at once and do various operations like search for errors and much more.

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Postfix MTA updated to fix security vulnerabilities such as incorrectly checks the ownership of a mailbox. In some configurations, this allows for appending data to arbitrary files as root. This update has been rated as having moderate security impact.

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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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Couple of quick question answered by me: => Host a domain without CPanel or Plesk Control Panel => Bash shell display only hidden (dot) files => Monitor Linux user activity in real time => Apache name based VirtualHost example => How do I find out my mail server blacklisted? => Solaris find out a package […]

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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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This is Part II in a series on Execute Commands on Multiple Linux or UNIX Servers Simultaneously. The full series is Part I, Part II, and Part III. Many times, you want to execute a command not only on one server, but also on several servers. For example, find out Version of kernel Version of […]

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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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