[ExchangeList] Re: Reverse DNS Look-up and Mail

  • From: "Richard Davis" <rkd@xxxxxxxxxx>
  • To: <exchangelist@xxxxxxxxxxxxx>
  • Date: Fri, 26 Oct 2007 12:26:53 -0500

------------------------------------------------------->A rDNS is certainly 
important but I dread the day when RBLs start
>requiring MATCHING rDNS.  That would be a b-i-g problem for mailservers
>legitimately hosting email for multiple independent domains.  It is
>generally not possible to force an email server to send out emails from
>one virtual multi-homed IP or another, as that part is generally
>controlled by the TCP/IP stack in the operating system.  (Virtual multi-
>homed IPs not to be confused with dynamic IPs).

Actually virtually hosted domains should not matter. The server
should ALWAYS send emails with it's own credentials no matter which
virtual domain it is sending for.

An example the server might be "exchange.domain1.com" and it might
host "domain2.com". When sending email the smtp prompt should always
return "exchange.domain1.com" even if it is sending email for
"dude@xxxxxxxxxxx". This way rDNS is always correct for the smtp
connection from that server.

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