[FW-1] Problems with Exchange 5.5

[Miguel Alvarez Reynoso]

Hi, We are having a problem with our Mail Server Exchange 5.5. Our mail was out a FireWall and now we are trying to protect it, we configure even any-to-any-accept traffic for this machine, NAT,  the machine can see the internet (DNS, Web Pages, ping other sites) you even can ping it from outside, but when we try to send external mail or try to receive from outside does not work. Anybody with that kind of problem?, need help, thanks.   Miguel