I need your help.I am unable to send mails to some address eg, Yahoo email address but I can recieve from them.This is the error that I am getting: Your message did not reach some or all of the intended recipients. You do not have permission to send to this recipient. For assistance, contact your system administrator. <TMCNT03.diarough.co.bw #5.7.1 smtp;550 5.7.1 Relaying denied for [ip address] Error code 6401 for support mail abuse <AT > walla dot net dot il>