Do not validate personal Contact Groups when sending e-mail messages

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

Registry

HKCU software\policies\microsoft\office\16.0\outlook\options\mail

Value name: expandpdlusingcache

Enabled: expandpdlusingcache = 0

Disabled: expandpdlusingcache = 1

Use only the local cache to obtain current user information when expanding a Personal Contact Group while sending e-mail