"E-mail represents the lifeblood of any professional services organization so we need the best results."

Glaser said the previous in-house antispam system eliminated most of the spam, but what was left still irritated staff.

Since engaging MessageLabs, Glaser said spam levels have dropped to about 0.01 percent or about one e-mail every two weeks for the average user.

He said another bonus is that internally there is no need to maintain any infrastructure.