November 2026
11 posts from November 2026.
How to Tell If an Email Bounced Because of Your Server or Theirs
Read the bounce code, check the MX records, and know in five minutes whether the fault sits with your server or theirs.
How to Check If Your Website's Redirects Are Sending Visitors in Circles
Find out whether your site's redirects form a chain or a loop, and fix the two rules sending visitors in circles.
How to Run a Blacklist Check Before You Send a Big Email Campaign
Check your sending IP and domain against the major email blacklists before a big campaign, and fix any listing before you send.
How to Check Whether Your SSL Certificate Covers Both the www and Non-www Versions of Your Site
Check whether your SSL certificate covers both example.com and www.example.com, and fix it if one version is missing.
How to Tell If a Domain Is Parked, For Sale or Just Unused Before You Plan Around It
A taken domain is not always a dead end. Run four quick checks to find out whether it is parked, for sale, or simply unused before you plan around it.
How to Read the User Agent in a Customer's Bug Report and Reproduce Their Problem
A bug report's user agent string names the customer's browser, OS and device. Here is how to read it and reproduce the problem yourself.
How to Work Out the Right IP Range Before You Set a Static IP at Home
Work out the right subnet size, range and static address for your home network before you touch your router settings.
How to Check Your DNS Records Before Changing Nameservers, So Nothing Breaks
Check every DNS record before you change nameservers, so your website and email keep working after the switch.
How to Tell Whether a Closed Port Is Your Router, Your ISP or Your Host
Work out whether a closed port is your router, your ISP, or the host itself, with checks in the order that narrows it down.
How to Fix a Website That Loads on Wi-Fi but Not on Mobile Data
Your site works on Wi-Fi but fails on mobile data. Follow this diagnosis in order to tell DNS, IPv6, SSL and firewall faults apart.
How to Check a Suspicious IP Address in Your Server Logs Before You Block It
Check a suspicious IP in your logs before you block it, so you stop real abuse without locking out real visitors.