image 21 540x304 - How to block / quarantine extensions in Proxmox Mail Gateway

How to block / quarantine extensions in Proxmox Mail Gateway

To block incoming emails in Proxmox Mail Gateway that contain attachments with a specific extension, for example, .cab I recommend blocking both the extension (MIME type) and the filename (files that end with .cab). To do this first log in to...

fixpermsphp 540x304 - Change Folder Permissions using PHP

Change Folder Permissions using PHP

Sometimes it’s useful to enable visitors to your site to upload content, for example, photos, which can then be displayed on the site. Folders on a website, for example, an images folder will typically have permissions of 755, which means that...

Wallpaper Linux Red Hat Ubuntu 2910x1637 wallup  540x304 - How to check and change runlevels in RHEL

How to check and change runlevels in RHEL

A runlevel is one of the modes that a Unix-based OS will run on. Each runlevel has a certain number of services stopped or started, giving the user control over the behavior of the machine. The following runlevels are defined by default under Red...

image 16 540x98 - Where are autoresponders and forwarders files on a cPanel server

Where are autoresponders and forwarders files on a cPanel server

On cPanel servers user forwarders and autoresponders are located in the  /etc/valiases/ directory and separate for each domain (Forwarders and autoresponders for all email addresses under domain example.net are located in the...

executable sticky bit permission.jpg - What is a sticky Bit and how to set it in Linux

What is a sticky Bit and how to set it in Linux

In this tutorial we will see about Sticky Bit, so what is a sticky Bit and how to set it in Linux? The sticky bit is set on directories to forbid all the users in the system to rename or delete the directory or the files/directories inside the...

centoshero 540x304 - Initial Server Setup with CentOS 7

Initial Server Setup with CentOS 7

When you first create a new server, there are a few configuration steps that you should take early on as part of the basic setup. This will increase the security and usability of your server and will give you a solid foundation for subsequent...