If a person says that they only collect mint or new cards, this means that they must be of "new" condition. Straight from the shop. There is nothing worse when doing a trade and the person that you exchange cards with sends you second hand or battered rejects, especially after you have gone out and brought their cards for them, brand spanking new! Ugh! Some people need a good clip between the ears!

If the person you are preping up to trade with, says that they so not like multi's or multiview cards. What they are saying is the multiple view cards that have several windows on their face with different views in them. Most people who don't like these cards, complain that they can't see the views clearly as the images are too small.

Freecards and rackcards are free postcards that you can get from different companies that are advertising their products. Some people only collect these cards while others don't want them at all. It depends on the person you are trading with so be sure to get their preferences. 

A lot of people do not like art, comic or recipe type cards either, so if you have them to trade, please do the right thing and ask the person that you are trading with first, before you send any of these type of cards. A great many people only get into postcarding so they can see different countries where other people live. So don't be a nerd and disappoint people by sending them totally useless cards that they don't want in the first place.

When mailing your postcards to someone, always be sure that the mailing label or area on the envelope is properly layed out addressed correctly. If you are unsure of the address format, ask! Email the person and ask them to lay the address out in the postal format for you, in the way that they would address the envelope as if they were sending it to themselves. If you use incorrect addressing, the addressee may not receive the cards and therefore may think that you are a bad trader. If your hand writing isn't legible, use a printed mailing label instead.

Don't forget to put your return address on the back of the envelope just incase there is a problem or the addressee has moved and the mail needs to be returned back to you. Also with a lot of people, they can usually be doing multiple trades at any one given time, so if they are doing several from your area to get a vast variety of cards for their collection, they will not know that it is you that has lived up to your end of the bargain if, you do not let them know personally by addressing the back of the envelope too!

Keep a list of who you have mailed postcards to and in the list mark down how many cards, the persons contact details, their preferences and what postcards you mailed to them. If you have a look on the back of the postcards, you'll find that most of them will have a serial number on them so you can utilise that number to keep your record of the postcards mailed. Also by keeping an accurate record, if later you decide to do another swap with that person, you'll be less likely to send them the same postcard twice!