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Re: Routing mails based on mail size

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  • Noel Jones
    ... Seems the solution is to change your MX records. ... Not natively. You might be able to cobble something together using an external policy service that
    Message 1 of 2 , Apr 2, 2012
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      On 4/2/2012 7:53 AM, niket joshi wrote:
      > Hi,
      >
      > In our setup we have mail firewall which receives all the emails
      > from Internet. We have 4 MX's and we have pointed all the MX IP's on
      > firewall with equal preference.
      >
      > We then NAT packets from mail firewall to Ironport which handles
      > Spam Filtering and delivers mails to mail cluster for delivery. On
      > Ironport all mails from mx1 goes to Ironport1, mx2 to Ironport 2 and
      > so on until MX4.
      >
      > The problem we are facing here is that all mails come to Ironport1
      > as mx1 is pointed to this IP and MX is cached by global MTA's. We
      > receive 75 mails in 10 seconds on our first Ironport whereas all
      > other Ironports are idle.

      Seems the solution is to change your MX records.

      > So we decided to route mails based on mail size before mails go to
      > Ironport. Does anyone have idea of how to do mail routing based on
      > mail size using postfix.

      Not natively. You might be able to cobble something together using
      an external policy service that returns "FILTER
      transport:destination" based on size.
      http://www.postfix.org/SMTPD_POLICY_README.html
      http://www.postfix.org/access.5.html



      -- Noel Jones
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