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Re: Outgoing hostname

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  • mouss
    ... then don t forget to configure rDNS so that the IPs are resolved to their domain (This is what would appear in the Received headers added by the next
    Message 1 of 12 , Mar 31, 2007
      Simon L Jackson wrote:
      > Jorey Bump wrote:
      >> Simon L Jackson wrote:
      >>> Simon L Jackson wrote:
      >>>> Simon L Jackson wrote:
      >>>>> I want to make the outbound hostname match the virtual domain MX
      >>>>> hostname.
      >>
      >> Can you explain why you want to do this? There is no required
      >> relationship between a domain's MX host and the host used to relay
      >> outbound messages from that domain.
      > Various factors including:
      > - Users associated with a specific domain use the primary MX as their
      > SMTP/POP3/IMAP server. We want the outgoing email to be directly
      > associated with their domain (we provide email for many domains)

      then don't forget to configure rDNS so that the IPs are resolved to
      "their" domain (This is what would appear in the Received headers added
      by the next MTA)
      > - We want to use the simplicity of SPF MX, that is outbound email
      > comes from the inbound mail servers.
      > - We want to completely hide the underlying server(s) and have each
      > virtual domain appear completely separate.
      > - We need to be able to move a virtual domain from one mail server to
      > another quickly and without DNS changes.
      > - We have lots of IP addresses available for mail services. (In fact
      > we also use a separate IP address for every web site to remove any
      > possible association between web sites and for other purposes.)
      >
      > We now have the separate instances working OK.
      >
      > However, something like smtp_bind_address_by_sender_maps would be the
      > best for us as it would allow specific outbound IP addresses to be
      > used based on the senders address. This would allow a more or less
      > unlimited number of fully separated virtual domains without having to
      > resort to separate instances.


      use sender-dependent relay hosts to forward mail to the customer
      instance, and configure this instance smtp bind address to use the right IP.
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