Step-by-step guides and fixes for server administrators: cPanel, DirectAdmin, Windows Server, email, DNS, security and more. Free to read, tested on real servers. Press / to search.
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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
Microsoft SNDS and JMRP Setup: 2026 Portal, Access and Reports
Set up Microsoft SNDS and JMRP on the 2026 portal: request IP or ASN access, the 10-month reattestation, reading filter and complaint data, and handling junk reports.
October 6, 2026
DMARCbis (RFC 9989): What Changed and Must You Edit Records?
DMARCbis (RFC 9989, 9990, 9991) explained: new np, psd and t tags, pct/rf/ri removed, the DNS tree walk, and whether you need to edit your DMARC record.
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
chan_sip to PJSIP Migration: sip_to_pjsip.py, Option Mapping, Tests
Migrate from chan_sip to PJSIP before Asterisk 21+: run sip_to_pjsip.py, fix what it misses, map common options, use fwconsole on FreePBX, and test.
October 6, 2026
Asterisk CLI Commands Cheat Sheet: PJSIP, Calls, Dialplan, Logs
PJSIP-era Asterisk CLI cheat sheet: endpoints, contacts, registrations, SIP and RTP debugging, dialplan, logging and safe restarts, checked on Asterisk 22.
October 6, 2026
PJSIP Endpoint Unreachable or Unavailable: Fix Qualify and NAT
Fix PJSIP endpoints and contacts showing Unreachable or Unavailable: what qualify does, how to read contact status, and fixing NAT keepalives, firewalls and stale contacts.
October 6, 2026
FreePBX PJSIP Trunk Setup: Registration, IP Auth, Routes, NAT
Set up a provider-neutral PJSIP SIP trunk in FreePBX 17: registration vs IP authentication, NAT, codecs, outbound and inbound routes, verification and fixes.
October 6, 2026
Upgrade FreePBX 16 to 17: Backup, Restore and Migration Checklist
Move from FreePBX 16 (SNG7) to FreePBX 17 (Debian 12) with backup and restore: CLI restore options, chan_sip conversion, licences and a cut-over checklist.
October 6, 2026
FreePBX Responsive Firewall vs Intrusion Detection (FreePBX 17)
FreePBX Responsive Firewall vs Intrusion Detection explained, why both are missing on open-source-only FreePBX 17, and how to rebuild the protection with fail2ban and your own firewall.
October 6, 2026