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    SubjectRe: notion of a local address [was: Re: ioctl SIOCGIFNETMASK: ip alias
    On Thu, 6 Sep 2001, Wietse Venema wrote:

    > If an MTA receives a delivery request for user@[ip.address] then
    > the MTA has to decide if it is the final destination. This is
    > required by the SMTP RFC.

    Would it not suffice, in the common case, to check if the
    local address that the SMTP connection was accepted on is
    the same as the IP address in the email address?

    As I see it, it breaks only for multihomed relays or weird
    configurations, (with values of "breaks" close to "incurs
    an extra SMTP transaction").

    You could even maintain a cache of IPs that SMTP connections
    had been accepted on.

    Matthew.

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