Protocol.config

1. PluginOperationPolicy=NeverSendThru

Disables Thru in Outlook, all emails are sent in a regular way, Thru buttons are disabled, Thru Options do not contain message policies.
Thru toolbar is visible in Outlook to enable use of Thru Explorer.

2. PluginOperationPolicy=DefaultSendThruModeOn

Enables Thru in Outlook, send email via Thru or regular mail according to a user selection. Thru Send Mode is enabled by default.

3. PluginOperationPolicy=DefaultSendThruModeOff

Enables Thru in Outlook, send email via Thru or regular mail according to a user selection. Thru Send Mode is turned disabled by default.

4. PluginOperationPolicy=AlwaysSendThru

Always send e-mail via Thru, user cannot change the setting