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The 3 Pillars of Email Authentication: SPF, DKIM, DMARC

If you’re an email marketer or maybe troubleshooting with email issue, you’ve probably heard acronyms like “SPF,”...

How to Reduce / Shrink the Size of a LVM Partition Formatted with XFS Filesystem

Issue: – How to reduce the size a partition formatted with xfs filesystem?– How can I reduce the size of a LVM partition formatted...

Recovery of a degraded 3ware RAID-Controller with tw_cli (ECC-ERROR)

You have a RAID-1 with 2 disks and one disk fails. You change the failed disk and everything seems good as the...

How to Install Tomcat 7 Server on Ubuntu or Debian

Apache Tomcat is a opensource webserver product of Apache Foundation like Apache HTTP server. It is used for deploying Java Servlet and JSP...

How to Install PostgreSQL 9.6 on Ubuntu 18.04 LTS

POSTGRESQL is an open-source, full-featured relational database.PostgreSQL is the most advanced open source relational database, MySQL did...

IMAPSync to Transfer mail from server to server/cPanel

There is an active feature request to have server/cPanel add a tool to help migrate IMAP Mailboxes from a non-cPanel server to...
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How To Import QCOW2 Image Into Proxmox

In this guide, we will see how to import QCOW2 into Proxmox hypervisor and how to create a virtual machine using the QCOW2 image...

Remove frozen emails from mail queue – Exim

Emails can build up for a variety of different reasons but mainly results from emails which were undelivered.  When...

Safe Reboot Of Linux Using Magic SysRq Key

If you are working on kernel development, or device drivers, or running a code that could cause a kernel panic, the SysRq...

How to set a MySQL database to read-only mode

When we need to set the database as read-only on the fly (such as rebuild MySQL replication purpose) and we will use...