exchange-online-admin

name	exchange-online-admin
description	Use when managing Exchange Online. Covers mailbox provisioning, shared/room mailboxes, mail flow rules, transport policies, anti-spam/phishing configuration, DLP policies, retention policies, and quarantine management.
user-invocable	true
disable-model-invocation	true
context	fork
allowed-tools	["Read","Write","Bash"]
argument-hint	email admin action (e.g., create shared mailbox, configure mail flow rule)
hooks	{"PreToolUse":[{"matcher":"Bash","hooks":"[Truncated]"}]}

Exchange Online Administration

Overview

Exchange Online mailbox management, mail flow rules, anti-spam/phishing, DLP, and retention policies using Microsoft Graph API and Exchange Online PowerShell.

Mailbox Management

Create Shared Mailbox

Connect-ExchangeOnline

# Create shared mailbox
New-Mailbox -Shared -Name "Support Team" -DisplayName "Support Team" `
    -Alias "support" -PrimarySmtpAddress "[e-mail]"

# Grant full access
Add-MailboxPermission -Identity "[e-mail]" `
    -User "[e-mail]" -AccessRights FullAccess -AutoMapping $true

# Grant send-as permission
Add-RecipientPermission -Identity "[e-mail]" `
    -Trustee "[e-mail]" -AccessRights SendAs -Confirm:$false

Create Room Mailbox

New-Mailbox -Room -Name "Board Room" -DisplayName "Board Room - Floor 3" `
    -Alias "boardroom" -PrimarySmtpAddress "[e-mail]"

# Configure room settings
Set-CalendarProcessing -Identity "[e-mail]" `
    -AutomateProcessing AutoAccept `
    -AddOrganizerToSubject $true `
    -DeleteComments $false `
    -DeleteSubject $false `
    -AllowConflicts $false `
    -BookingWindowInDays 180 `
    -MaximumDurationInMinutes 480

Mailbox via Graph API

# Get mailbox settings
curl -s https://graph.microsoft.com/v1.0/users/[e-mail]/mailboxSettings \
  -H "Authorization: Bearer $ACCESS_TOKEN"

# Update automatic replies (out of office)
curl -X PATCH https://graph.microsoft.com/v1.0/users/[e-mail]/mailboxSettings \
  -H "Authorization: Bearer $ACCESS_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "automaticRepliesSetting": {
      "status": "scheduled",
      "scheduledStartDateTime": {
        "dateTime": "2026-03-10T08:00:00",
        "timeZone": "UTC"
      },
      "scheduledEndDateTime": {
        "dateTime": "2026-03-15T17:00:00",
        "timeZone": "UTC"
      },
      "internalReplyMessage": "I am currently out of office.",
      "externalReplyMessage": "I am out of office. For urgent matters, contact [e-mail]."
    }
  }'

Mail Flow Rules

Disclaimer / Email Footer

New-TransportRule -Name "Company Disclaimer" `
    -FromScope InOrganization `
    -ApplyHtmlDisclaimerLocation Append `
    -ApplyHtmlDisclaimerText @"
<div style="font-size:11px;color:#666;">
<p>CONFIDENTIAL: This email is intended only for the named recipient(s).
If received in error, please notify the sender and delete immediately.</p>
</div>
"@ `
    -ApplyHtmlDisclaimerFallbackAction Wrap