Hello, I have PIX 520 Firewall behind Internet router and The Altavista firewall behind the PIX firewall,the DMZ between PIX firewall and Alta Vista Firewall, the Internal LAN behind Alta vista Firewall and the mail server is located in the internal LAN (MS Exchange 5.5)And I haven't Mail Relay in the DMZ yet. I configured The PIX firewall to forward the inbound mail to Alta Vista firewall and I configured the Alta vista firewall to forward the inbound mails to the mail server but the mail server does't receive any mail and It hasn't any problem to send the mail to outside. Any one can help me in my problem please ? Thanks Khaled __________________________________________________ Do You Yahoo!? Get email at your own domain with Yahoo! Mail. http://personal.mail.yahoo.com/?.refer=text _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]