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SMTP Outbound traffic

Dear Experts,

i would like to know how to secure SMTP outbound traffic in corporate network, i have two mail servers and using Dell NSA 2400.

thanks in advance..
0
itubaf
Asked:
itubaf
1 Solution
 
Syed_M_UsmanCommented:
Dear,

in any email server envoirment you have to protect your SMTP traffic by allowing traffic "ONLY" from your email server...
you need to create two rules by allowing SMTP traffic only for email server and deny all smtp traffic for other hosts... this will prevent any other Fake or infected host sending SMTP traffic outside...
 
logon to SNA> Network >Address Objects>Add>
Name: O_Exchange
Zone Assignment: LAN
Type: HOST
IP Address: YOUR EXCHANGE IP, ok

Go to Firewall > Access Rules (LAN > WAN)>Add
Action: DENY
Service: SMTP (Send email)
Source: ANY
Destination: Any
Users Allowed: All, ok
Above Rule will prevent any fake user/email server sending email outside.

Go to Firewall > Access Rules (LAN > WAN)>Add
Action: Allow
Service: SMTP (Send email)
Source: O_Exchange
Destination: Any
Users Allowed: All, ok
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