Amid a report that Amazon (AMZN - Get Report) is testing a delivery service to compete with FedEx (FDX - Get Report) and UPS (UPS - Get Report) , TheStreet's founder and Action Alerts PLUS Portfolio Manager Jim Cramer said this isn't a reason to sell the two legacy delivery stocks.

Cramer said Amazon is looking to bolster its third-party operation and doesn't want to go into the delivery service 

Cramer prefers FedEx over UPS. 

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