/ignore XXXX

where XXXX is the name of the person of the opposite faction
If the person is online the ignore will go through
If the player is offline, you'll get the 'Player Not Found' error

Ready for the next level? We recommend The MMORPG Exchange for your wow gold needs. MMORPG-Exchange has supplied us for years and has great customer service and 24/7 instant delivery. Check them out! World of Warcraft gold.