*Civil servants are not allowed to receive cash tips. But if you wish to recognize your mail carrier, the U.S. Postal Service asks that your gratuity not exceed $20 in cash value.

Are you supposed to tip the mailman?

Tipping the mail carrier may be the most common practice that's technically against the law. Federal regulations forbid postal employees from accepting cash or cash equivalents — that includes that Visa gift card, although they can accept gifts worth $20 or less.

How much do you tip the mailman?

Mailman.

Regular U.S. Postal Service mail carriers aren't allowed to get cash tips, gift cards or checks, so tipping them is a no-no. They also can't accept gifts valued at more than $20.