As I’ve wrote in the article: “10 Tips for Auditing & Improving Mail Server Performance“, Dkim or Domainkeys is one feature that can be used to increase the acceptance rate (eligibility) of email on the destination mail server. DomainKeys or DKIM signature basically allowing good senders to “sign” a message to prove that it really did come from…
Imapsync is a tool for facilitating incremental recursive IMAP transfers from one mailbox to another. It is useful for mailbox migration or backup, and reduces the amount of data transferred by only copying messages that are not present on both servers. Read, unread, and deleted flags are preserved, and the process can be stopped and…
VirtualBox is one of the tools that are used for Desktop Virtualization : running an OS within the OS. VirtualBox usually installed on the operating system that already has the VirtualBox GUI to manage it. But, how to manage VirtualBox without VirtualBox GUI? VBoxHeadless is the answer if we want to install VirtualBox on minimal Linux server…
Sometimes we may want to reset the user password for a while, such as setting up a new system or migration from the old mail server and want to clean up old password. Below are a simple script to bulk-reset Zimbra account password : [code language=”bash”] #!/bin/bash clear USERS=`su – zimbra -c ‘zmprov -l gaa’`;…
openSUSE 12.1 (and also prior version) can be installed without using a cd or dvd. This is the most efficient way if we have running system and do not want to waste a cd/dvd. This also the most efficient way if we have prior version and want to upgrade or clean install running system directly through the network….
Zimbra mail server has it’s own anti spam based on SpamAssasin and anti virus addon based on ClamAV to block incoming and outgoing malicious. The default addon has a pretty good performance when configured properly, but if you want to increase the security of Zimbra mail server, fail2ban is an additional plugin to be considered. What is…
When it comes to the world of technology, if you don’t spend all day working on computers it can sometimes seem a little daunting when it comes to computer lingo and working out what means what. With a little time you will soon see that expressions that may initially seem confusing are actually straight forward…
Zimbra has released Zimbra 7 for about a month and it seems quite stable for production use. As major upgrade to Zimbra 6, Zimbra 7 comes with tons of bug fixes and new features including security feature to prevent virus and spam. Does the upgrade process should be applied for production use ? The answer depends on your environment. If…
I’m currently using 5 OS in my Laptop, HP 4421s : FreeDOS/Windows, openSUSE, LinuxMint, Fedora & Ubuntu. The main goals are for testing purpose only but I would prefer to install all of those OS in physical instead of virtual because I’m trying to use different OS for work and daily usage. Our client has…
Following tutorial will covers DomainKeys/DKIM implementation using OpenDKIM on SLES or openSUSE. Domain KeysIdentified Mail (DKIM) is a technology designed to make it difficult or impossible for criminals to steal the identities of legitimate organizations. This authentication technology allows good senders to “sign” a message to prove that it really did come from them.. DKIM originally written as…