Local mailboxes are stored in the location indicated by "Local mailbox directory path" in Configuration / Mercury core module. In that folder there will be one sub-folder for each local user.

Messages for non-local recipients will be in the Queue directory while being processed, but will not be stored on the server after that.

/Rolf 

Hi, Since I know about mercury mail, I'm using this as mail server for testing web page. When I send mail to server, in where folders it save the messages? thanks before.