Resources
My day-to-day work often spills over into notes, small tools and command lists. I gather them here: they extend what you have seen on the rest of the site.
Resources
Blog
Technical notes on email, DNS, Microsoft 365 and the workstation.
Tools
Free tools to diagnose DNS and email, audit a website, split a calendar or work out a network.
Cheatsheets
Command cheatsheets (GAM, PowerShell, Windows, Git…) with instant search.
A problem, the right resource
A few common situations, with what to type. The addresses are made up (toto@domain.com, domain.com): swap in your own.
A mail from toto@domain.com lands in spam
Paste its headers: the tool shows the path the message took, then the SPF, DKIM and DMARC results.
The DNS of domain.com has just changed
Query several public resolvers and compare their answers to see how far propagation has gone.
domain.comGet into the BIOS of a Dell PC
F2 for the BIOS/UEFI, F12 for the boot menu. Other brands are in the cheatsheet.
Split the 192.168.10.0/24 network
Network address, broadcast, host range and subnets, in IPv4 or IPv6.
192.168.10.0/24Understand SPF, DKIM and DMARC
An article on what each record is for and how to check them.
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