spamBlocker scans each file up to a specified kilobyte count. Any additional bytes in the file are not scanned. This allows the proxy to partially scan very large files without a large effect on performance.
The default scan limit for spamBlocker is 100 Kb for all devices except Firebox T10 and XTM 2 Series models, which have a default scan limit of 60 Kb. The minimum scan limit is 1 Kb for all Firebox and XTM device models.
The maximum scan limit is 2000 Kb for all XTM devices except Firebox T10 and XTM 2 Series models, which have a maximum scan limit of 60 Kb.