Hi, I have designed my setup as follows : Internet > SMTP relay subsystem for Inbound e-mails from Internet > Firewall > Perimeter Network (All servers here like Exchange, Front-End, ISA server) > Firewall > Back-End servers. Outgoing e-mails is from separate SMART Host using IIS. Incoming via separate smtp relay system. I do have thorough understanding of Exchange. However, I lag on security part. could anyone guide how to encrypt all Incoming and Outgoing e-mails to Internet domains ? Chow, Jac

Most internet email services don't allow relaying email anymore due to spammers/hackers. Give a person a fish, they eat for a day. Suggest they internet search and they learn a skill for a lifetime.

I am relaying outgoing using my own smart host. How do i encrypt outgoing e-mails? e..g: let's say i sent an e-mail from my enterprise exchange to my rediff account. can it be sent encrypted?

If both ends can do ipsec you can secure the transmission. Give a person a fish, they eat for a day. Suggest they internet search and they learn a skill for a lifetime.