LuKreme wrote:
On 17-Aug-2009, at 04:24, Ned Slider wrote:
Question - in Postfix do "user unknown" rejections still incur a dns
RBL lookup, or does the rejection occur before reject_rbl_client?
HELO/EHLO rejections do not reach RBL, and neither do unknown, as long
as you specify the right order in the smtpd_recipient_restrictions
settings. These should be 'cheapest to most expensive' which means RBLs
should be last.
The order IS important on the restrictions.
Indeed, but rejecting unknown local recipients isn't a function of
smtpd_*_restrictions. From my observations, it would appear that
rejecting unknown local recipients occurs after smtpd_*_restrictions,
and thus after any RBL lookups.
Checking my logs appears to confirm this, where I see spamhaus
rejections for mail with an "unknown" local envelope_to address.
For example:
Aug 18 14:55:32 Quad postfix/smtpd[12739]: NOQUEUE: reject: RCPT from
unknown[77.31.23.91]: 554 5.7.1 Service unavailable; Client host
[77.31.23.91] blocked using zen.spamhaus.org;
http://www.spamhaus.org/query/bl?ip=77.31.23.91;
from=<lafsxo...@icwconsultancy.nl> to=<tej...@example.com> proto=ESMTP
helo=<77.31.23.91.dynamic.saudi.net.sa>
where tej875 certainly isn't a known or valid address at that domain.
