Beginning in 2018, the IRS doesn't allow you to deduct hobby expenses from hobby income. you must claim all hobby income and are not permitted to reduce that income by any expenses. For tax years prior to 2018, you can deduct hobby expenses as an itemized deduction subject to 2% of your adjusted gross income. The taxpayer must still report the income they receive on Schedule 1, Form 1040, line 21.
If it is business/gig income, the postage would be a deductible expense on the Schedule C.
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