> I agree, but only for 'transient' DNS errors (such as unable
> to contact name server). However, if you get an authoritative
> response that says "domain doesn't exist" then there is no point
> in retrying. If you accidentally send a message to ilug at linus.ie,
> which would you prefer:
Absolutely right, Kenn, the case of authoritative answers is different.
> And this particular case is different. It's not the dest addr
> that doesn't resolve, it's the source address. I don't want
> thousands of spam messages with fake sender addrs to clog up
> mail queues all over the net.
Well, postfix allows me to fine-tune this nicely :)
I have different tables for blocked hosts/domains, addresses,
and networks (Chinese Telecom Good Bye - spam dropped to nought),
all on top of the usual RBLs.
> > | unknown_hostname_reject_code = 450
>> I disagree. Of course, I haven't read 822 in a long time. Maybe
> I should. Maybe it would change my mind. Maybe it won't. Maybe
> that particular recommendation has been superseded by another RFC.
Hhm, I'll have to dig into the docs. According my logs, postfix
does the right thing for non-existant domains, i.e. bounces.
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