Configurations (Linux)

XEAMS mail Server Installation on CentOS 6

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Installation Instructions

Follow the steps below to install Xeams on a Linux machine.Log in as root

  1. Download the installer
  2. Extract the tar file using the following command 
     tar -xf XeamsLinux.tar
  3. Ensure the permissions for Install.sh is set as an executable. If not, use the chmod +x Install.sh command to change its permission
  4. Execute Install.sh script

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Publishing long domain key SPF TXT records in bind9

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If your bind is throwing error with long TXT data, you can do the following means to concatenate: You are using commas to separate your key/value pairs in your record instead of semi-colons. Change it to:

a9d04665528b593d263a6e5256648c99._domainkey IN 1800 TXT (
 "k=rsa;p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAz2/ZfhxSI/A"
 "bqgh0amM8ylrlosirWeKShUhq7fg12aYmRwOqq9hIzO0Fcz1BzfgHVu6HU++rC5"
 "QoUK0JQK/nk4jwkDgvG2di2ZYmAvEbY/VeiK1x/TG0p1Iczr2k6Bj0gEAb/YGD2"
 "YbwrwAi4bDXwoPsYuuNn9TB3jjyWKu/dvOsqhff1/4Wc+FkOi0ClvgrXiklN28X"
 "TLjyjSyU794ntIoegXxrfwcwkhfPMvuqcnhfIC0Z8L71M4WR4SoHyNHVfBtNlUv"
 "VNROiXlMxtxnNQvfViSwz6LC8bYIxeAba3hSXPTChKu3qZtfR0o3jFwEWAfLQdg"
 "Ixler0jMEoAyJmfQIDAQAB")

 

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How to Upgrade Node.js via NPM

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Steps to Upgrade Node.Js

Use the following steps to install or upgrade node.js to latest available version. Current NodeJs Version – First check current nodejs version on your system using following command. In my case it is

v0.10.37.rahul@tecadmin:~$ node -v
v0.10.37

Clean Cache Forcefully – Now clean all npm cache from your system forcefully.

rahul@tecadmin:~$ sudo npm cache clean -f

npm WARN using –force I sure hope you know what you are doing.

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Installing Certbot on Debian 8

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root@server:~# cat /etc/apt/sources.list

deb http://ftp.de.debian.org/debian/ jessie main
deb-src http://ftp.de.debian.org/debian/ jessie main

deb http://security.debian.org/ jessie/updates main
deb-src http://security.debian.org/ jessie/updates main

deb http://ftp.de.debian.org/debian/ jessie-updates main
deb-src http://ftp.de.debian.org/debian/ jessie-updates main

deb http://ftp.debian.org/debian jessie-backports main

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Failed to open /var/mail/root : No such file or directory

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If you’re receiving the following message on webmin- “Failed to open /var/mail/root : No such file or directory”.

Possible resolution is-

rumi@mordor:~$
rumi@mordor:~$ sudo touch /var/mail/rumi
rumi@mordor:~$ sudo chown thufir:mail /var/mail/rumi
rumi@mordor:~$ sudo chmod o-r /var/mail/rumi
rumi@mordor:~$ sudo chmod g+rw /var/mail/rumi
rumi@mordor:~$
rumi@mordor:~$ mail
No mail for thufir
thufir@mordor:~$

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Best Practices on Email Protection: SPF, DKIM and DMARC

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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

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Apache Virtual Hosts on Debian 7

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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

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