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I have several clients who are having the same problem. &nbsp;If you look in Exchange System Manager (both in 2000 and 2003), under smtp current connections, there are a number of domains/ip addresses that seem to stay connected for an extended period of time. &nbsp;Some for 10-20 minutes, which can slow the server down considerably. &nbsp; If I disconnect them manually, they seem to just pop back upeither with the same address, or a different one. &nbsp;Is there a way to have Exchange (or another service) to automatically reject smtp connections that are coming from a known blacklisted source? &nbsp;Or even if they do not contain a reverse lookup.
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I have several clients who are having the same problem.  If you look in Exchange System Manager (both in 2000 and 2003), under smtp current connections, there are a number of domains/ip addresses that seem to stay connected for an extended period of time.  Some for 10-20 minutes, which can slow the server down considerably.   If I disconnect them manually, they seem to just pop back upeither with the same address, or a different one.  Is there a way to have Exchange (or another service) to automatically reject smtp connections that are coming from a known blacklisted source?  Or even if they do not contain a reverse lookup.

Exchange SMTP connections staying active for a long period of time.

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).