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What do you mean by HELO DNS lookups?
HELO is "smtp" and has nothing to do with DNS. In fact we need DNS queries A/MX of the receiver domain and in some cases the receiver ( no so much for the MX ) .
Are you seeing many false -pos or having mail delivery issues?
PCNSE
NSE
StrongSwan
thank you for your fast respond.
i had read a lot of information and the best desecration is:
Whenever a client opens an SMTP session with a server, the client sends a HELO command with the client domain name. The FortiGate unit takes the domain name specified by the client in the HELO and does a DNS lookup to determine if the domain exists. If the lookup fails, the FortiGate unit determines that any messages delivered during the SMTP session are spam.
The HELO DNS lookup is available only for SMTP traffic.
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