Get-TransportRuleReport

<#
.SYNOPSIS
    Reports all Exchange transport (mail flow) rules.

.DESCRIPTION
    Exports every transport rule with its priority, enabled state, and a
    short summary of its conditions and actions, since a tenant that has
    been running a while usually has more mail flow rules than anyone
    remembers, some of them contradicting each other.

.EXAMPLE
    .\Get-TransportRuleReport.ps1

.NOTES
    Requires ExchangeOnlineManagement and an active Connect-ExchangeOnline session.

.AUTHOR
    Shehryar Hassan
#>

$rules = Get-TransportRule

$report = $rules | ForEach-Object {
    [pscustomobject]@{
        Name       = $_.Name
        Priority   = $_.Priority
        Enabled    = $_.State -eq "Enabled"
        Conditions = ($_.Description -split [Environment]::NewLine | Select-Object -First 1)
        Mode       = $_.Mode
    }
}

$report | Sort-Object Priority | Format-Table -AutoSize