In an embarrassing incident, F-Secure's anti-virus mailing list was a vector for Netsky.B spread. The problem arose because the mailing list was unmoderated, and an infected computer in the U.S.A. posted to the list. F-Secure took, "immediate steps to change how messages can be sent to this list" to prevent a repetition. F-Secure is not the first anti-virus company to make a similar blunder.