[Exim] sender_verify, lookuphost MX and A records

Top Page
Delete this message
Reply to this message
Author: Bruno Vuillemin
Date:  
To: exim-users
CC: Bruno.Vuillemin, postmaster
Subject: [Exim] sender_verify, lookuphost MX and A records
Hello everybody

Problem :
When performing a "sender_verify" action on incoming mail, it seems that
the various lookuphost routers are tested. As a result of our configuration
(see below),
a domain with no MX but only an A record is rejected though it shouldn't be.
I thought that these routers were for outgoing mail ("remote addresses") only
and not
for verification.

How can I configure exim to accept messages from domains with either
an MX _or_ an A record while keeping our lookuphost configuration?

---

Excerpt from our configure file :

(I replaced some real domains by "some-other-domains")

# Main configuration settings
sender_verify
local_domains = @:unifr.ch:*.unifr.ch:some-other-domains.ch
end
# routers configuration
#
# follow MX discipline for computers outside our network
lookuphost_mx:
driver = lookuphost
domains = "!*.unifr.ch:!*some-other-domains:*"
transport = remote_smtp
# don't do an MX request for computers in our network
# do an A request
lookuphost_a:
driver = lookuphost
domains = "*.unifr.ch:*.some-other-domains.ch"
transport = remote_smtp
gethostbyname=true
# RFCs require this
literal:
driver = ipliteral
transport = remote_smtp
end
----
Now If I want to verify anonymous@??? :
451 rejected: temporarily unable to verify sender address (try again later)
<anonymous@???>

---
The test : (using the -bi option as advised by this so good documentation)


$HOME/bin/exim -bh 216.156.2.4

**** SMTP testing session as if from host 216.156.2.4
**** Not for real!

>>> host in host_lookup? yes (0.0.0.0/0)
>>> looking up host name for 216.156.2.4
>>> IP address lookup yielded ns1.9netave.com
>>> host in host_reject? no (option unset)
>>> host in host_reject_recipients? no (option unset)
>>> host in sender_unqualified_hosts? no (option unset)
>>> host in receiver_unqualified_hosts? no (option unset)
>>> host in helo_verify? no (option unset)
>>> host in helo_accept_junk_hosts? no (option unset)

220 siufuxsun04.unifr.ch ESMTP Exim 3.03 #1 Mon, 06 Nov 2000 15:28:32 +0100
HELO mail7.9netave.com

    I got this name from the log file after the problem was dectected.


250 siufuxsun04.unifr.ch Hello ns1.9netave.com [216.156.2.4]
MAIL FROM: anonymous@???
>>> anonymous@??? in sender_reject? no (option unset)
>>> anonymous@??? in sender_reject_recipients? no (option unset)
>>> host in sender_verify_hosts? yes (*)
>>> verifying sender anonymous@???
>>> anonymous@??? in root@@? no (end of list)
>>> anonymous@??? in exim@@? no (end of list)


(lot of lines without too much interest)

>>> web.directnic.com in local_domains? no (end of list)

ok
>>> web.directnic.com in "!*.unifr.ch:!*.some-other-domains:*"? yes (matched *)


?????? what's going on ?
       The only place in the configuration file where this string exists
       is where the lookuphost_mx lookuphost driver is defined. Why does it 
appears here ?
       this is not outgoing mail ...


>>> web.directnic.com in dns_again_means_nonexist? no (end of list)
>>> temporary error while verifying anonymous@??? - will give

error after DATA
ok, this is the origin of the problem.
250 <anonymous@???> is syntactically correct
...

Last remark : web.directnic.com doesn't have any MX (at the time of writing)
but does have an A record.

What does I do/understand wrong ?
Any comments ?

Thanks in advance.

Bruno Vuillemin
-- 
-------------------------------------------------------------------------------
Bruno.Vuillemin@???          {post/ftp/cache/news/unix}master@???
Service Informatique              tel (0(041)26)300.7206 
Universite de Fribourg            fax (0(041)26)300.9704
{Schweiz/Suisse/Svizzera/Svizra/  Switzerland}    
-------------------------------------------------------------------------------