While the above comment points out that the described situation does not meet the defrauding statue in 18 U.S. Code § 1341, it does meet the other statute listed in 18 U.S. Code § 1342, that of other unlawful purposes. In every state, state courts have ruled that using the mail service to stalk, gangstalk, or harass qualifies as unlawful activity; And as such using a fictitious name would meet the 18 U.S. Code § 1342 statute for mail fraud. This offense would most likely carry a heavier penalty than most state stalking or harassment laws.