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NAT and filter rules for mail server

preet
Our mail server is on DMZ with a private IP address,there is a additional address on the external interface of firewall configured with the MX IP of mail server.
Could anyone tell which all SNAT/DNAT and packet filter rules needs to be applied.


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  • 0
    In this forum i found many such example and everywhere its all about DNAT
    Any--SMTP--External Mail Alias Interface--DNAT---Internal Mail Server
    What about the SNAT rule?
  • 0 in reply to preet
    If you are using the external IP of the Astaro and you have a masquerade rule, you shouldn't need to SNAt your SMTP.

    If you are using an additional IP, you will need an SNAT [internal server ip > SMTP > Any > external IP alias] so that the outbound email will come from an IP matching your MX record.
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  • 0 in reply to preet
    If you are using the external IP of the Astaro and you have a masquerade rule, you shouldn't need to SNAt your SMTP.

    If you are using an additional IP, you will need an SNAT [internal server ip > SMTP > Any > external IP alias] so that the outbound email will come from an IP matching your MX record.
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