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Re: unwise filtering policy from cox.net
On Wed, 21 Nov 2007, Sean Donelan wrote:
full) or the normal server administrators may make changes which affects all addresses passing through that server (i.e. block by IP address).
I guess you're saying there's something architectural in email that makes it impossible/difficult (limitation) to apply different policy to the LHS.
That's not correct though. The receiving MTA is quite free to apply differing policies to different LHSes. And at least one MTA allows you special-case measures applied to tables of addresses, such as whether DNSbl lookups should be applied.
SMTP is distributed, so you do of course have to take care to keep distributed policy consistent. But, again, that has nowt to do with LHS/RHS of email addresses.
regards, -- Paul Jakma paul@xxxxxxxx paul@xxxxxxxxx Key ID: 64A2FF6A Fortune: A plumber is needed, the network drain is clogged