Illegal Trades:
Do not steal other people's trade threads. (you may be warned for this, as it is spamming).
No trades via PM. (It's harder to prove a scam via PM than from a trade thread, so always negotiate and deal through a trade thread, not PM).
Do not trade for / sell real life items outside the Donor Forum. This includes but is not limited to CD keys. No linking to any outside auction or trade sites.
Do not trade accounts, characters, or names. (Exceptions: Eve Online)
Be specific in your trades. List everything that is for sale, especially in packages, with as much detail as possible. Unlimited quantity sales are not allowed.
Do not offer fg/items you don't have.
Do not trade items cross games/realms/cores.
Do not use false advertising to describe an item. For example, if an item is a common dupe and is being sold in mass, it cannot be described as legit/perm/whatever else you may use to imply the same meaning.
Do not advertise items not directly for sale via d2jsp. This includes advertising an item that is on an auction house within a specific game.