Best Practices on Email Protection: SPF, DKIM and DMARC

Once we installed Zimbra Collaboration, we need to be aware of some additional configurations that will allow us to send emails to other Email systems with an improve Security, such Gmail, Hotmail, Yahoo!, etc. This Wiki article will show the different Email Protection resources that exists, depends of the volume of sent email, will be better to implement only one, or two, or maybe all of them, depends.

SPF
Sender Policy Framework (SPF) is an email validation system, designed to prevent unwanted emails using a spoofing system. To check this common security problem, SPF going to verify the source IP of the email and compare it with a DNS TXT record with a SPF content. 

Where needs to be configured?
SPF needs to be configured in the Public DNS Continue reading “Best Practices on Email Protection: SPF, DKIM and DMARC” »

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Apache Virtual Hosts on Debian 7

Virtual Hosts are used to run more than one domain off of a single IP address. This is especially useful to people who need to run several sites off of one virtual private server– each will display different information to the visitors, depending on which website the user is accessing.There is no limit to the number of virtual hosts that can be added to a VPS.

Set Up
The steps in this tutorial require the user to have root privileges. You can see how to set that up in the Initial Server Setup. Choose whichever username you fancy.

Additionally, you need to have apache already installed and running on your virtual server. If you haven’t already done so, use the following command:

sudo apt-get install apache2

Continue reading “Apache Virtual Hosts on Debian 7” »

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Convert squid timestamps

When you work with a squid access log file you sometimes want to know when a site or resource was accessed. Squid does not store the date and time information for that in a human readable format.

It is stored as <unix timestamp>.<centisecond> so you can use a command like that to post-process to make it more readable for you:

cat access.log | perl -p -e 's/^([0-9]*)/"[".localtime($1)."]"/e'
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Zimbra 8 on Ubuntu 14 with DKIM activation

Step 1 – connect to your server, get root privileges and install this package.

apt-get install libgmp10 libperl5.18 unzip pax sysstat sqlite3 dnsmasq wget

Configure hostname and DNS Server
In this tutorial will use the ‘dnsmasq’ resolving nameserver to speedup DNS lookups in Zimbra. Dnsmask has been installed as prerequisite in the first chapter, so we just have to configure it now:

Step 1 – Edit hostname and hosts Continue reading “Zimbra 8 on Ubuntu 14 with DKIM activation” »

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Outlook settings for vestacp

Properly set up a Mail Client in Vesta Control Panel

  • You can use Thunderbird, Apple Mail, Outlook or Outlook Express
  • Use full e-mail address as username
  • IMAP and SMTP STARTTLS with normal passwords

Example Settings:

Username: william.cage@alpha-mimic.ltd
password: aXly8Kbiqo

IMAP hostname: alpha-mimic.ltd
IMAP port: 143
IMAP security: STARTTLS
IMAP auth method: Normal password
SMTP hostname: alpha-mimic.ltd
SMTP port: 587
SMTP security: STARTTLS
SMTP auth method: Normal password

Congratulations, you now have all set up!

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Upgrade mysql 5.5 to 5.6 in Ubuntu 14

While I was installing idoit- the cmdb and IT documenting platform, struggling with a pre-requisite of having mysql version 5.6 which is not shipped by native in ubuntu 14 installations. So had to google it and found some solution, however the one that worked for me which I’m sharing below:

step 1 : remove old mysql

sudo apt-get remove mysql-server
sudo apt-get autoremove

step 2 : install new version of mysql

sudo apt-get install mysql-client-5.6 mysql-client-core-5.6
sudo apt-get install mysql-server-5.6
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How to Monitor your Linux and Windows Servers with CloudStats

CloudStats is a server monitoring service which allows you to monitor your whole server infrastructure from a single dashboard interface and helps timely to prevent any kind of technical issues and downtimes. With CloudStats it is possible to monitor Linux servers, including those on CentOS, Debian, Fedora, Ubuntu etc.

CloudStats server monitoring Agent collects data about all key server metrics such as CPU, RAM and disk space usage, as well as a status of networks, processes, URLs or IPs. This information will be kept and displayed in your CloudStats account interface.

Almost every user can easily setup and run CloudStats without any special skills or knowledge.

Here is an instruction of how to perform Linux server monitoring using CloudStats.

1. Go to sign-up page and create a new account by adding your “Subdomain” name, it could be anything like your company name or website name (in our example – ‘ravisaive‘).

2. In the CloudStats online interface you can add your server for monitoring. To add new server click on the green button “Add New Monitor” and select “Add New Server”. Continue reading “How to Monitor your Linux and Windows Servers with CloudStats” »

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Creating Nginx Virtual Hosts

Step One— Create a New Directory

The first step in creating a virtual host is to a create a directory where we will keep the new website’s information. This location will be your Document Root in the nginx virtual configuration file later on. By adding a -p to the line of code, the command automatically generates all the parents for the new directory.

sudo mkdir -p /var/www/example.com/public_html

You will need to designate an actual DNS approved domain, or an IP address, to test that a virtual host is working. In this tutorial we will use example.com as a placeholder for a correct domain name.

However, should you want to use an unapproved domain name to test the process you will find information on how to make it work on your local computer in Step Six.

Step Two—Grant Permissions

We need to grant ownership of the directory to the right user, instead of just keeping it on the root system. You can replace the “www-data” below with the appropriate username.

sudo chown -R www-data:www-data /var/www/example.com/public_html

Additionally, it is important to make sure that everyone is able to read our new files.

sudo chmod 755 /var/www

Now you are all done with permissions. Continue reading “Creating Nginx Virtual Hosts” »

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