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276918Re: barracuda and relayhost

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  • Wietse Venema
    May 1, 2011
      James:
      > Why does the barracuda think the "Client host" is ISP2.smtp but it
      > blocks the IP of my server?
      > Shouldn't relayhost make the barracuda see the "Client host" AND IP as
      > ISP2.smtp?

      They look at the message header to find out where ISP2.smtp received
      the message from, and that's how they find your server's IP address.

      Some DNSBLs are designed to block *DIRECT* mail from residential
      IP addresses, but the Barracuda is mis-configured - it uses this
      DNSBL also for correctly *RELAYED* mail.

      Wietse
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