Sign all e-mail messages

Supported on: At least Windows Server 2008 R2 or Windows 7

Registry

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

Value name: alwayssign

Enabled: alwayssign = 1

Disabled: alwayssign = 0

Description

This policy setting controls whether Outlook requires digital signatures on all outgoing e-mail messages. If you enable this policy setting, Outlook requires all outgoing messages to be digitally signed before being sent. If you disable or do not configure this policy setting, Outlook does not require outgoing messages to have digital signatures.