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SubjectRe: notion of a local address [was: Re: ioctl SIOCGIFNETMASK: ip alias bug 2.4.9 and 2.2.19]
Wietse Venema <> wrote:
> An SMTP MTA is required to correctly recognize user@[ip.address]
> as local. That's the rules, like it or not. These address forms
> are actually being used, like it or not.

Yes. MTAs have to work around this; qmail does a reasonable job. Why
not look at how djb does this? See ipme.c.

> It also is desirable for an MTA to treat clients on local subnets
> different than strangers that happen to be on the same class A,
> like it or not. Failure to do so can make one end up on black
> lists, like it or not.

Having an MTA automatically treat clients on "local subnets" differently
than the rest of the 'net at large is definitely _not_ desirable. The
administrator should have to explicitly configure the MTA to grant
additional access to every subnet he desires; anything else is begging
for trouble in the form of absued relaying privileges.

Charles Cazabon <>
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