Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it.

Defines all of the registry parameters that are used to configure the protocol driver, Tcpip.sys, which implements the standard TCP/IP network protocols.

If you attempt to send a Simple Mail Transfer Protocol (SMTP) message to a long list of recipients through the SMTP service, an access violation may occur.