Post&Parcel--The US Postal Service is hoping to win a bigger slice of the $90bn US media advertising market by offering some of the nation's top advertisers a money-back guarantee to test out direct mail campaigns.

    From as early as next month, it will be offering 16 major advertisers the chance to try out direct mail in a market trial called "Mail Works Guarantee".

    The companies will be those spending at least $250m a year on advertising, but do not currently use the mail for a significant amount of promotional activity - those where postage represents less than 0.36% of their advertising budgets. Read more!
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