Message ID (msg ID) is a unique identifier assigned to each electronic message. It is used to track the message’s progress through a network and to ensure that it is delivered to the correct recipient. Msg IDs are typically generated by the sender’s email server and are included in the message’s header.
Msg IDs are important because they allow messages to be tracked and managed. They can be used to identify messages that have been delayed or lost, and to troubleshoot problems with message delivery. Msg IDs can also be used to prevent duplicate messages from being sent.