i have found some errors on my exchange server ( Exchange 5.5 sp4 ). It seems that someone tries to relay on my mail server but wheni try some test from the internet i can not relay. The event ID i get is 4031 on MSExchangeIMC with the following msg : The description for Event ID ( 4031 ) in Source ( MSExchangeIMC ) could not be found. It contains the following insertion string(s): <>, Undeliverable: ilanm,Tis the season.. , <Engen@xxxxxxxxx>, 553 VS10-RT Possible forgery or deactivated due to abuse (#5.1.1). what should i check ???