TMA-M365-DKIM-ENABLED

Ensure DKIM signing is enabled for all Exchange Online domains

中レベル 1自動m365

説明

DKIM signatures let receivers verify mail really came from your domains and are a prerequisite for an enforcing DMARC policy. Prints the number of domains whose DKIM signing configuration is not enabled (expected 0). Requires an already-connected Exchange Online session: Install-Module ExchangeOnlineManagement; Connect-ExchangeOnline (View-Only Organization Management is sufficient). The audit throws if no session exists.

チェック方法

監査方法: シェルコマンド

shell

$ErrorActionPreference = 'Stop'; if (-not (Get-Command Get-ConnectionInformation -ErrorAction SilentlyContinue) -or -not (Get-ConnectionInformation)) { throw 'Not connected: run Connect-ExchangeOnline first' }; $bad = @(Get-DkimSigningConfig -ErrorAction Stop | Where-Object { $_.Enabled -ne $true }); $bad.Count

期待される出力: 0

修正方法

修正方法: ガイダンスまたは IaC パッチ

Publish the selector1/selector2 CNAME records shown by Get-DkimSigningConfig -Identity <domain> | Format-List Selector*CNAME, then New-DkimSigningConfig -DomainName <domain> -Enabled $true or Set-DkimSigningConfig -Identity <domain> -Enabled $true.

プロパティ

オペレーティングシステム: すべて
タグ: m365mail-auth
参照: CIS Microsoft 365 Foundations Benchmark v7.0.0 - Exchange Online / DKIM (verify section number for your release)

このホストをチェック

監査が許可されているマシンで実行してください。スキャンは読み取り専用です。

shell

tmaegis scan --target m365