Introduction Postfix is a widely used, free Mail Transfer Agent (MTA) designed to route and deliver email securely. Because email servers are frequent targets for spam and abuse, hardening Postfix is an important step to improve security and reduce unwanted mail traffic. Postfix hardening focuses on restricting how external systems… Continue Reading Post fix Hardening – configure postfix with anti spam blacklisting.

Introduction In some VPS environments, you may receive a Disk quota exceeded error even when sufficient disk space is available. This usually happens when the inode limit has been fully utilised. An inode stores metadata about files. When the inode usage reaches 100%, new files cannot be created even if… Continue Reading How to Increase Inode Value in a VPS Container

Introduction If you are unable to log in to Horde with the correct email username and password, the issue may be due to missing domain entries in the server configuration files. Prerequisites Implementation Horde Login Issue If you cannot log in to Horde for any mail account of the domain… Continue Reading Horde mail issue

Introduction This error occurs in R1Soft when creating a backup through CDP (Continuous Data Protection). The issue usually happens after resizing the filesystem or disk volume on the server. Prerequisites Implementation Error CDP returns the following error while creating a backup of the server: Not enough data in the sum… Continue Reading R1soft Error: “not enough data in sum file to read BlockSum”

Introduction Remote Desktop Protocol (RDP) logs help administrators monitor login activity on Windows servers. By enabling audit policies, you can track successful and failed RDP login attempts through the Windows Event Viewer. Prerequisites Before proceeding, ensure: Enable RDP Audit Logs Step 1: Open Run Press: Step 2: Open Group Policy… Continue Reading How to Enable and Check RDP Logs in Windows Server

Introduction You can change the WordPress admin username and password directly from the MySQL database using SSH access. Prerequisites Implementation Log in to the server and navigate to the website’s public_html folder. Then execute the following commands: vi wp-config.php Check the database name used by WordPress and stop using it:… Continue Reading Steps to reset the wordpress admin login in database

Introduction Telnet can be used to manually test SMTP mail sending by communicating directly with a mail server. This method is commonly used for troubleshooting mail delivery issues and verifying SMTP server responses. Prerequisites Before using telnet for sending mail, ensure the following: To install telnet (if not installed): Steps… Continue Reading Sending Mail via Telnet (SMTP Testing)

Introduction Windows Firewall helps protect the server by controlling inbound and outbound network traffic. You can create firewall rules to allow specific ports required for applications or services. Prerequisites Before proceeding, ensure: Implementation Step 1: Open Control Panel Step 2: Open Windows Firewall Type: in the search box and select:… Continue Reading How to Open a Port in Windows Firewall

Introduction Sometimes, PHP mail scripts may fail while sending emails through Exim due to TLS-related issues with remote SMTP servers. This issue can generate transport errors in the mail logs. Prerequisites Implementation Problem The following error may appear while sending emails using PHP scripts: T=remote_smtp defer (-1): smtp transport process… Continue Reading Error while sending mail using PHP scripts

Introduction Sometimes while installing or upgrading packages in Debian using apt-get, package configuration errors may occur due to broken or incomplete kernel package installations. Prerequisites Before proceeding, ensure: Issue You may encounter errors similar to the following while running apt-get: Reason This issue usually occurs because the following kernel packages… Continue Reading How to Fix Debian 5 apt-get Package Installation Issues