Configure DKIM with Office 365

Description Many administrators are familiar with SPF (Sender Policy Framework) as a system to declare and verify who can send emails from a domain. In the fight against spam and phishing, SPF is not enough anymore. DKIM (DomainKeys Identified Mail) is an email authentication system based on asymmetric cryptographic keys. Læs mere…

Debloat Windows 10

Run the following in Powershell What this script can do:Installs Chocolatey, Notepad++, Irfanview, VLC, Java, and asks if you want Adobe Reader or Brave.Removes all Windows Store Apps EXCEPT office, xbox, and WSL.Removed TelemetryDisables CortanaDeletes various schedules tasks that rebloat the systemRemoves Other Bloatware (Candy Crush, etc.)Fixes problems that other Læs mere…

Veeam Retention Policies

Removal of Restore Points To keep up with the retention policy, Veeam Backup & Replication deletes the whole backup file from the backup chain, not data for separate VMs from the backup file. In some situations a certain VM may have fewer restore points than it is specified in retention policy settings. This can happen Læs mere…

Subnet Cheat Sheet

Addresses Hosts Netmask Amount of a Class C /30 4 2 255.255.255.252 1/64 /29 8 6 255.255.255.248 1/32 /28 16 14 255.255.255.240 1/16 /27 32 30 255.255.255.224 1/8 /26 64 62 255.255.255.192 1/4 /25 128 126 255.255.255.128 1/2 /24 256 254 255.255.255.0 1 /23 512 510 255.255.254.0 2 /22 1024 Læs mere…

Office 365 – Setting Default Calendar Permissions To Reviewer For All Users

Step 1: Connect to Exchange Online using PowerShell $Credential = Get-Credential$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $Credential -Authentication Basic -AllowRedirectionImport-PSSession $Session Step 2: Generate a list of all mailboxes $users = Get-Mailbox -Resultsize Unlimited Step 3: Set Default access to Reviewer for all User mailboxes foreach ($user in $users) {Write-Host Læs mere…