Mail databas access logg

A question regarding Notes mail and who has logged in. I can check the mail-database property and see who has been opening my mail database. It is always my user-id but sometimes the user opening the database is System Signer. What can this be? Is it someone opening my mail or it is an application?Thank you.

Subject: probably the server or an application

It is probably the server or an application agent. your Email Admin should be able to tell you what account “System Signer” is associated with.