Security issue: SMTP and qmail

[Marcus Korte]

Hi,

I have set up an internal mailserver based on qmail and RH6.2 behind a
firewall.
There are some security aspects in which I am not sure about.
If SMTP is opened in the firewall, the machine could easily be hacked I
assume.
Are there any recommendations how to secure smtp on qmail?

Thx!

Marcus

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