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Excessive postage
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Handwritten or poorly typed addresses
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Incorrect titles
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Title, but no name
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Misspellings of common words
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Leaky powder or substance
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Oily stains, discolorations or odor
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No return address
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Excessive weight
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Lopsided or uneven envelope
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Protruding wires or aluminum foil
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Excessive security material such as masking tape, string, etc.
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Visual distractions
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Ticking sound
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Marked with restrictive endorsements, such as “Personal” or “Confidential”
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Shows a city or state in the postmark that does not match the return address