You need to perform the following steps to configure SMTP archiving:
Ensure that the prerequisites are satisfied for the Enterprise Vault server and SMTP archiving.
See the "Enterprise Vault prerequisites" section of the Installing and Configuring manual for more information, including "Additional prerequisites for SMTP archiving".
Install and configure the Enterprise Vault SMTP archiving components on the Microsoft SMTP Server computer.
On the Microsoft SMTP Server computer, create a suitable SMTP archiving configuration file.
Run SMTP archiving to populate the holding area with the files to be archived.
On the Enterprise Vault server, configure File System Archiving to archive from the domain root folders of the holding area.
More Information
Installing the SMTP archiving components
Setting up the SMTP archiving configuration file
Setting up File System Archiving to archive the SMTP messages