The war against spam has helped boost revenues for Surfcontrol, the British web and email filtering firm.

In a trading update today, the company said it had invoiced $25.8m (£14m) during a record third quarter, ended 31 March. SurfControl said Q3 trading was positive and that the content security market is robust with demand "remaining high".

In the Americas region, invoicing grew 17 per cent year-on-year, while other areas combined to generate a 25 per cent increase in demand.

Said chief exec Steve Purdham: "We saw a 21 per cent year-on-year increase in group invoicing, and importantly a 17 per cent year-on-year increase in invoicing in our Americas region. We continue to be cautiously optimistic of a satisfactory outcome for the year as a whole."

By noon, shares were up 4p (0.69 per cent) at 580p. SurfControl will publish full unaudited Q3 results on April 27. ®

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