S/MIME receipt requests behavior: registry value respondtoreceiptrequestsUserHKCU\software\policies\microsoft\office\16.0\outlook\security

Policy ID: L_SMIMEreceiptrequests
Scope: User Configuration
Supported on: At least Windows Server 2008 R2 or Windows 7
Source: Microsoft 365 Apps / Office Administrative Templates (version 5568.1000)
Category: Microsoft Outlook 2016 › Security › Cryptography

Registry

respondtoreceiptrequests

REG_DWORDUser

HKCU\software\policies\microsoft\office\16.0\outlook\security Current key

Enabled value: Depends on the option value
Element: Handle messages with S/MIME receipt requests in the following manner:

Options
Item	Stored value
Open message if receipt can't be sent	0
Don't open message if receipt can't be sent	3
Always prompt before sending receipt	1
Never send S/MIME receipts	2

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\outlook\security]

; Options (use only one)
; Open message if receipt can't be sent
"respondtoreceiptrequests"=dword:00000000
; Don't open message if receipt can't be sent
"respondtoreceiptrequests"=dword:00000003
; Always prompt before sending receipt
"respondtoreceiptrequests"=dword:00000001
; Never send S/MIME receipts
"respondtoreceiptrequests"=dword:00000002

CMD

:: Options (use only one)

:: Open message if receipt can't be sent
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\security" /v "respondtoreceiptrequests" /t REG_DWORD /d 0 /f
:: Don't open message if receipt can't be sent
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\security" /v "respondtoreceiptrequests" /t REG_DWORD /d 3 /f
:: Always prompt before sending receipt
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\security" /v "respondtoreceiptrequests" /t REG_DWORD /d 1 /f
:: Never send S/MIME receipts
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\security" /v "respondtoreceiptrequests" /t REG_DWORD /d 2 /f

PowerShell

# Common: create the key
New-Item -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\security' -Force | Out-Null

# Options (use only one)
# Open message if receipt can't be sent
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\security' -Name 'respondtoreceiptrequests' -PropertyType DWord -Value 0 -Force | Out-Null
# Don't open message if receipt can't be sent
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\security' -Name 'respondtoreceiptrequests' -PropertyType DWord -Value 3 -Force | Out-Null
# Always prompt before sending receipt
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\security' -Name 'respondtoreceiptrequests' -PropertyType DWord -Value 1 -Force | Out-Null
# Never send S/MIME receipts
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\security' -Name 'respondtoreceiptrequests' -PropertyType DWord -Value 2 -Force | Out-Null