We currently have our filter set to accept 500 connections at a time (which I believe is the default). On occasion, simultaneous connections have reached this number and when they do, the spam filter hangs.

We are currently at version 4.0.0.772.

saracen,

We had actually uploaded SpamFilter v4.0.0.775 around Apr 4 as scheduled, with the fix for the problem we had discovered internally. Have you tried using builds 775 or higher to see if the problem is still there?

The release note that applies is:

// New to VersionNumber = '4.0.1.782';
{TODO -cNew : There was a limit of 65535 emails that could be queued in the quarantine and the queue directories in case the DB or the dest. SMTP servers were offline. Stopped using the Windows API to create temp files and are now using GUIDs to eliminate this limitation}

// New to VersionNumber = '4.0.1.780';
{TODO -cNew : Added the ability to specify additional failover destination SMTP servers for each domain}

// New to VersionNumber = '4.0.0.775';
{TODO -cFix : Eliminated the extra "--" when logging the event "Bypassed all rules for: user@domain.com --" in the activity log}
{TODO -cNew : Use Windows Messages to update the real-time activity log in GUI rather than creating a new thread to update each line in the GUI memo control. Done to improve performance in high traffic sites and to reduce number of threads used}

saracen,

If you login the registered area of the website you will have access to all the latest pre-release versions of SpamFilter as mentioned in the release notes.