Internet Mail Service

Diagnostics logging service	Diagnostics logging category	Description
MSExchangeIMC	Initialization/ Termination	Events related to starting and stopping the Internet Mail Service.
MSExchangeIMC	Addressing	Address resolution, including directory searches and proxy generation.
MSExchangeIMC	Message Transfer	The movement of messages and message queue operation.
MSExchangeIMC	SMTP Interface Events	Interactions between Simple Mail Transfer Protocol (SMTP) hosts.
MSExchangeIMC	Internal Processing	Operation of the Internet Mail Service.
MSExchangeIMC	SMTP Protocol Log	Monitors SMTP connections. Setting the diagnostics logging level to Medium sends basic protocol information to text logs in Imcdata\Log. Setting it to Maximum sends entire unformatted packets to the same text logs.
MSExchangeIMC	Message Archival	Saves the text of messages. Setting the diagnostics logging level to Medium or Maximum writes each message to a file in Imcdata\In\Archive or Imcdata\Out\Archive.