Symantec has snapped up six-month-old router supplier TurnTide for an undisclosed sum.
TurnTide sells a spam-filtering router called the Anti-Spam Router that identifies and blocks internet traffic from "abusive senders".
The buy is Symantec's second spam-related acquisition in the past month. On 22 June, the company finalised a $370m (£m) cash acquisition of Brightmail.
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TurnTide was founded by entrepreneur Joshua Kopelman, who set up online retailer Half.com in July 1999. Half.com was purchased by eBay a year later in a stock transaction.
Robert McMillan writes for IDG News Service