In a previous life as a DNS admin I was responsible for mail delivery. Going through my old notes I found a few handy links.

Mail Header Analyzer

https://mha.azurewebsites.net

SPF Tools

https://dmarcian.com/spf-survey/

https://vamsoft.com/support/tools/spf-policy-tester

The Immutable ID is used to link an on-premise user object to an entra ID user object.

Sidenote, I should really move these snippets to Github

$UserObject = Get-ADUser "CN=User1,OU=Corp.Users,DC=itsrob,DC=local" -server dc1.itsrob.local
$UserObjectGuid = $UserObject.ObjectGUID
$UserObjectGuidBase64 = [System.Convert]::ToBase64String($UserObjectGuid.ToByteArray())
write-host
write-host $UserObjectGuidBase64

I came across this handy website in my travels. It appears to be well maintained:

https://msportals.io/

For a while now, Microsoft has been making memorable URLs by shortening them via the “aka.ms” prefix, which I truly appreciate.

One of my favourites addresses a pet peeve of mine: people who ping me with a mere “hello”.

See more here: https://aka.ms/nohello

This is a site to keep IT discussions separate from my personal site. I spend most of my day in Microsoft Entra ID and many ancillary technologies.