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← cd ~/graph-permissions
// graph-permissions · MailboxItem

MailboxItem.ReadWriteMicrosoft Graph permission · Medium risk

Allows the app to read, write, and delete the user's mailbox items, on behalf of the signed-in user.

Delegated permission

Medium risk

Read and write your mailbox items. Allows the app to read, write, and delete the user's mailbox items, on behalf of the signed-in user.

IDec1ade38-5268-4bc8-87fa-b230e42f7a88
ConsentNeeds admin consent
RiskCan make changes. Check the scope is as narrow as possible.

Ask for it when signing in

Delegated permissions act as the signed-in user, so the app can never do more than that user can.

powershell1 line
Connect-MgGraph -Scopes "MailboxItem.ReadWrite"

Which apps already have it?

powershell6 lines
# Apps with delegated consent for MailboxItem.ReadWrite
Connect-MgGraph -Scopes "Application.Read.All", "Directory.Read.All"
$graph = Get-MgServicePrincipal -Filter "appId eq '00000003-0000-0000-c000-000000000000'"
Get-MgOauth2PermissionGrant -All |
    Where-Object { $_.ResourceId -eq $graph.Id -and ($_.Scope -split " ") -contains "MailboxItem.ReadWrite" } |
    Select-Object ClientId, ConsentType, PrincipalId

Other MailboxItem permissions

Check every app in your tenant → Permission explainer

Sources