This is the second article of “Building Anti Spam Appliance Using Untangle” series. Its contents are part of the training material on my startup company, PT. Excellent Infotama Kreasindo for the subject “Security Hardening & Improving Mail Server Performance”. The training itself utilize Untangle as its base system for anti spam appliance. Introduction article can be found here : How to Build an Anti Spam Appliance Part 1 : What is Anti Spam Appliance and Untangle?
Picture taken from http://www.roundpulse.com/wp-content/uploads/2012/12/email_icon_generator_less_spam.jpg
After understanding what kind anti spam appliance is and why we choose Untangle as base system on the previous article, we can now continue to Untangle installation steps. Before trying to install Untangle, prepare the server with the following minimum requirement :
- Intel Pentium 4 Processor. Celeron is not recommended
- 1 GB memory for less than 50 users
- 80 GB Harddisk
- 2 sets of NIC/Network Card for LAN & WAN
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As a powerful mail server, Zimbra has some system security features applied by default. We can also applying some additional security policy to increase mail server protection, such as applying PolicyD and Fail2Ban
All the above security rule may be sufficient, but there are some additional security tips should be considered, especially in the case of SMTP authorization.
Look at the following mail flow delivery, sent from or into Zimbra :
From : External User To : External User, Result : Relay Access Denied
telnet mail.mycompanydomain.co.id 25
Connected to mail.mycompanydomain.co.id.
Escape character is '^]'.
220 mail.mycompanydomain.co.id ESMTP Postfix
250 2.1.0 Ok
554 5.7.1 <email@example.com>: Relay access denied
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What is VMware vCenter Server Appliance?
Prior to vSphere 5.0, we can only run vCenter on Windows Server, either on physical or virtual machine (VM ). Since vSphere 5.1, VMware provide an option to run vCenter in the form of VM appliance.
vCenter Server Appliance ( vCSA ) is a package system based on SUSE Linux Enterprise Server 11 64 bit. In early versions of vCSA, it includes IBM DB2 database that sufficient to manage maximum 5 vSphere host or up to 50 VM. In vCSA 5.5, VMware replace IBM DB2 databases with vPostgres and increase capability so that each vCSA can handle up to 300 hosts and 3000 VM.
Just like Windows -based vCenter Server, vCSA can also be managed using web access or via vSphere client, although VMware improving web based applications so that most of the new features can only be managed through vCenter Web Access client.
Beloved, my favs song from my fav artist : Vivian Chow.
Have you heard about Vivian Chow before reading my post ? Vivian Chow Hui Min is a popular singer and actress from Hong Kong, known as Mandarin artist. I became her big fans since 1990, 1 year after finished my elementary school :-D.
Vivian Chow known with her beautiful face, with a beautiful long hair. She has earned a reputation for being a kind and humble superstar. However, she did not forget her many great friends along her path to fame, nor does she become arrogant because of her popularity. Therefore, the media dubbed her as Jade Girl for her beautiful, yet elegant appearance, and pure heart.
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One of the commons SysAdmin job is perform server management. VMware vSphere management server can actually be done remotely using the vSphere Client access (based on Windows) , Web Client or can also use 3rd party mobile applications .
Along with the development of technology, remote server management via mobile devices such as gadgets or tablet getting absolutely necessary. For this purpose, VMware released a mobile application to perform vSphere management, especially for critical VM monitoring. This application name is : VMware vSphere Mobile Watchlist.
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