Travel purchasing outside of approved channels isn't new and it may not even be a growing problem, but it's still a problem. Traxo has been working to solve the challenge for several years. Adding to a few approaches already in the market, the company's new Filter solution seems likely to fit the bill for many clients.

Filter is more a set of rules than a piece of software. Corporate email administrators can install it on enterprise server software from Google and Microsoft within hours, according to Traxo officials. It works like a spam stopper.

"Instead of catching . . .

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