I am having Exchange 5.5 behind a firewall. Is there any problem if I do not close the relay? The configuration of the PIX 515E Firewall is very well done. Can someone advise. Regards Thomas E. Kamire Systems Engineer Kenya Airways Ltd, P.O. BOX 41010 Nairobi, Kenya Tel: +254+2+32072311 Cell: +254 722 483 253 <mailto:thomas.kamire@xxxxxxxxxxxxxxxxx> thomas.kamire@xxxxxxxxxxxxxxxxx "Lets Make Things Better - Together" <http://www.kenya-airways.com/>