Outlook 550 5.7.515: Fix the High-Volume Sender Rejection
Fix Outlook.com 550 5.7.515 "sending domain does not meet the required authentication level": the 5,000-a-day rule, SPF, DKIM, DMARC and alignment checks.
October 6, 2026
Emails Going to Junk in Outlook and Hotmail: Sender-Side Fix
Why your mail lands in Outlook.com or Hotmail junk and how to fix it from the sending side: authentication, IP checks, SNDS reputation, JMRP complaints and content.
October 6, 2026
BIMI VMC vs CMC: Requirements, DMARC and Which Inboxes Show Logos
BIMI VMC vs CMC compared: trademark vs 12-month prior use, DMARC enforcement, SVG Tiny PS rules, and which mailbox providers (Gmail, Yahoo, Apple) show the logo.
October 6, 2026
MTA-STS on cPanel and DirectAdmin: Policy File and TLS-RPT
Set up MTA-STS on cPanel or DirectAdmin: create the mta-sts subdomain, host .well-known/mta-sts.txt with a valid certificate, add the DNS and TLS-RPT records and test.
October 6, 2026
Find cPanel, DirectAdmin and MySQL Passwords from the CLI (and One-Time Login Links)
Short answer: cPanel and DirectAdmin do not keep the root, WHM or admin password anywhere you can read it back. They are normal Linux user passwords, stored only as hashes in /etc/shadow. You either reset them or, better, log in with a one-time login link created from the command line. What you can read as
October 6, 2026
Server hacked: incident response runbook for Linux and cPanel Pro
An incident response runbook for a hacked Linux or cPanel server: contain it, preserve evidence, find the entry point, decide clean or rebuild, rotate credentials in the right order and tell customers.
September 30, 2026
MySQL/MariaDB won’t start: crash recovery runbook Pro
When MariaDB won't start after a crash, this runbook reads the error log first, matches the common causes, walks innodb_force_recovery levels 1 to 6 safely, and rebuilds from a dump on cPanel and DirectAdmin.
September 30, 2026
Mail server IP blacklisted: delisting runbook Pro
What to do with a mail server IP blacklisted by Spamhaus, Barracuda or Microsoft: find and stop the source, clean the queue, fix rDNS, SPF, DKIM and DMARC, delist, and relay mail meanwhile.
September 30, 2026
Disk full on a production server: recovery runbook Pro
A recovery runbook for a disk full on a production server: safe space to free first, inode exhaustion, what never to delete, and how to bring MySQL, Exim and Dovecot back cleanly after ENOSPC.
September 30, 2026
Multi-Server Health Check over SSH Pro
A multi-server health check that logs in to every server in a list over SSH, in parallel, and grades load, memory, disk, inodes, units, updates, clock and mail queue as OK, WARN or FAIL.
September 30, 2026
cPanel Migration Preflight Check Pro
A cPanel migration preflight check that compares the source server with the destination over SSH and prints a go/no-go report: versions, PHP, collisions, IPs, DNS, disk and database risks.
September 30, 2026
Server Inventory Report
A one-page server inventory report for Linux: OS, hardware, disks, IPs, control panel, web server, PHP, database and mail versions, firewall, backups, open ports and pending updates.
September 30, 2026