pfSense Site-to-Site IPsec VPN: Connecting Two Networks Securely
A site-to-site IPsec VPN lets two separate networks — a branch office and headquarters, or two data centers — ...
Proxmox Backup Server: Deduplicated, Incremental VM Backups Explained
The default vzdump backup built into Proxmox VE works, but it re-copies the full VM disk every single run ...
Setting Up a Proxmox VE High-Availability Cluster with Ceph Storage
A single Proxmox node is a single point of failure: if the hardware dies, every VM on it goes ...
Plesk WordPress Toolkit: Bulk Manage, Clone, and Secure WordPress Sites
Managing five WordPress sites by hand is tedious. Managing fifty by hand is a job in itself. Plesk's WordPress ...
Automating cPanel with the WHM API (whmapi1) and UAPI: A Practical Guide
Anything you can click in WHM or cPanel, you can script — and if you're provisioning more than a ...
WHM Reseller Hosting Setup: Packages, ACLs, and Branding for Resellers
Reseller hosting lets a WHM server owner sell hosting capacity to a third party who then creates and manages ...
SPF Flattening: Fixing the 10 DNS Lookup Limit Without Losing Deliverability
SPF has a hard limit, defined in RFC 7208: a receiving server will process at most 10 DNS lookups ...
How to Get Delisted from Spamhaus, Barracuda and Other Blacklists
Mail that was delivering fine suddenly starts bouncing, or a receiving server's rejection message mentions a domain like zen.spamhaus.org ...
IP and Domain Warm-Up: A Day-by-Day Plan for New Mail Servers
A brand-new IP address or sending domain has zero history with mailbox providers — and no history reads as ...
Reverse DNS (PTR) Records and Email Deliverability: Setup and Troubleshooting
SPF, DKIM and DMARC all live in your domain's forward DNS zone, which you control directly. PTR records don't ...