Messaging Gateway (SMG) spam quarantine does not display the full message subject line for quarantined messages with subject lines longer than 39 characters. The administrator access to the spam quarantine displays a mouseover tooltip for these entries with the full subject but for end users the tool tip is not displayed.
Admin spam quarantine view with tooltip
End user spam quarantine view with no tooltip
This issue has been addressed with the SMG 10.6.3 release.