I frequently get emails from visitors who think they found a spelling error on the website. Yes, there are some, unfortunately "sink" is not one.
You might want to consider a spelling correction. The word "sink" is used repeatedly throughout the article, which most commonly refers to a place where you wash dishes. I believe the word you are wanting to use, is "sync"; this is an abbreviation or shortened version of synchronize (the feature within Outlook that the article is referencing).
Sink is a proper term when used in the context of "event sinks" which are used as listeners which determine what the server should do next. It should not be confused with "event sync" which is the synchronization of events. Exchange server does both of these so its understandable that readers are confused.
An event sink, or a listener, is a piece of coding that defines how a server or computer should handle given events. Event sinks are often used in spam filters to trigger actions in response to the receipt of an e-mail message with specific characteristics or certain types of attachments.
For example, a event sink directs messages meeting certain characteristics away from the user's inbox. Such messages may be sent to a quarantine folder or be rejected outright. Each time a message is directed away from the inbox, the program may notify the sender and/or the intended recipient, depending on how the program is written.
Event sinks can be used to download attachments to certain drives or folders, or block/ignore them. They can be used to quarantine or reject messages with suspicious characteristics, or reject large messages. You can also use them to route network traffic to specific destinations, depending on characteristics or content.