The function that allows you to attach gold to in-game mail has been temporarily suspended effective the patch on September 21, 2011.
We understand that this will impede trade, and we apologize for the inconvenience. However, we believe this is a necessary measure in our ongoing efforts to combat gold sellers and stabilize the in-game economy.
Gold is the only type of attachment that will be affected. Players will still be able to attach items and exchange mail as before. This is a temporary change, and the function will be reinstated shortly.
We thank you for your patience and understanding.
-The Vindictus Team-