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Old 9th August 2013, 20:56
fbifido fbifido is offline
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Default ASSP v2.3.3 Flow Setup

Can you do a step-by-step tut on ASSP v2.3.3 on CentOS 6.4 and Ubuntu LTS 12.04.2 using the flows below:
as well as what to change in the web interface to make the config work:

pc1-Firewall (iptables)
pc2-ASSP+SMTP_Relayer (ASSP v2.3.3)
pc3-Exchange (Exchange 2013)

1) simple flow:
(IN) Internet-->25/465/587_ASSP-->25_Exchange
(OUT) User-->225_ASSP-->25_Exchange-->Internet
Exchange send email via DNS.

2) best flow:
(IN) Internet-->25/465/587_ASSP-125_SMTP_Relay-->25_Exchange
(OUT) User-->25/465/587_Exchange-->225_ASSP-125_SMTP_Relay-->Internet
Exchange send email via SSL/TLS

1. make sure not an open-relay/spoof attack
2. firewall only allow port 25 out from:
flow1:, flow2:
3. In flow2 Relay to internet only if email comming from port 225 on ASSP
4. Secure communication between:
a) ASSP and SMTP_Relay
b) SMTP_Relay and Exchange
c) Exchange and ASSP
d) Users and Exchange/ASSP

5. is there a way in linux to only allow a program (say postfix) to access a port (say port 25), maybe using iptables?

Thank you.
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