Thermo,

We'll actually categorize this one as a bug! We were indeed able to reproduce this, and will try to have it solved as soon as possible.

Following are the release notes:

// New to VersionNumber = '3.5.3.671';
{TODO -cFix : Sometimes adding a new domain in SFE could cause the filter settings to be reloaded in memory for no reason every minute}
{TODO -cFix : Certain regional locale settings prevented the SpamFilter Enterprise Activation code to be validated}
{TODO -cFix : Redesigned internal operations to attempt avoiding GUI freezes and lockups}
{TODO -cNew : Spam Emails with multiple recipients, where one is in the "Unfiltered Emails" with the :TAG option, will now be split so they get delivered to the unfiltered address}
{TODO -cNew : In SFE, entering duplicate domains in the local domains via the GUI could cause SpamFilter to crash}
{TODO -cNew : In SFI, duplicate entries are now automatically removed from the blacklist/whitelists files}
{TODO -cFix : Exception occurred during PerformPostStartupTasks_TrayIconVisible: Cannot create shell notification icon}
{TODO -cNew : The MAPS and keywords blacklist entries are not automatically sorted anymore, allowing users to specify the lookup order}
{TODO -cNew : Added new customizeable error response if recipient is not in AuthorizedTO whitelist - ResponseNotInAuthorizedTO}