Tenon Intersystems has updated Post.Office 3.5.3, its mail server and lists server for Mac OS X, to version 722, which is a free upgrade for registered users. The product now comes with a script that can be run in conjunction with McAfee’s Virex as a daemon launched on system restart to scan messages for viruses and search out unwanted file attachments. For new users, Post.Office is offered on a sliding scale, depending upon how many mailboxes and mailing lists are needed. A starter package costs US$295 and supports 100 mailboxes and 10 lists; for 10 accounts or less, Post.Office is free.