If you send your letter carrier away from your door with empty hands this Christmas, you may be doing it wrong, according to Lizzie Post, co-author of the 18th edition of "Emily Post's Etiquette."


Although it's typically the time of year to exchange gifts with friends and family members, it is also the time for end-of-the-year tipping, CNNMoney reported. 


According to Post, common recipients of these gifts include house cleaners, baby sitters and nannies, hairstylists, yard workers, trash collectors and building doormen.


While Post suggests you shouldn't feel pressured to give more than you can afford, finding some way to show your appreciation for those who work in the service industry is a good rule of thumb.


So, how much should you tip? According to the article, here's a quick guidance, taking into consideration that some employees - including letter carriers - aren't allowed to accept monetary gifts:

- Live-in nanny: One week's pay and a gift from your kids.

- Dog walker: Up to one week's pay or gift.

- Newspaper carrier: $10-$30 or a small gift.

- Building superintendent: $20-$80 or a gift.

- Trash/recycling collector: $10-$30 each. If it is a municipal service, then check city regulations first.

- Letter carrier: Small gift that is no more than $20 in value.


In addition to a tip, Lydia Ramsey, an etiquette expert and author of "Manners That Sell," said it's also nice to include a handwritten card.