Bug#361919: exim4: Dropping all hosts with ignore_target_hosts results in "host lookup did not complete"

[Marc Haber]

On Tue, Apr 11, 2006 at 10:38:00AM +0200, Magnus Holmgren wrote:
> The following routers for remote domains (the reason for this
> configuration is left as an excercise to the reader)
> 
> -------------------------->8------------------------------
> lookuphost:
>   driver = dnslookup
>   domains = ! +local_domains
>   ignore_target_hosts = ! ::::/0 : ! 85.194.0.0/18 : ! 212.214.126.0/24 : ! 85.8.0.0/20
>   same_domain_copy_routing
>   transport = remote_smtp
> 
> smarthost:
>   driver = manualroute
>   domains = ! +local_domains
>   transport = remote_smtp
>   route_list = * smtpserver.stunet.se:mail.visit.se
>   no_more
> --------------------------8<------------------------------
> 
> give the following (partial) output for exim4 -d -bt
> holmgren at lysator.liu.se:
> 
> -------------------------->8------------------------------
> --------> lookuphost router <--------
> local_part=holmgren domain=lysator.liu.se
> checking domains
> lysator.liu.se in "@ : ittma-hohah : localhost : kibibyte.se : mail.kibibyte.se"? no (end of list)
> lysator.liu.se in "! +local_domains"? yes (end of list)
> calling lookuphost router
> lookuphost router called for holmgren at lysator.liu.se
>   domain = lysator.liu.se
> DNS lookup of lysator.liu.se (MX) succeeded
> DNS lookup of mail.lysator.liu.se (AAAA) gave NO_DATA
> returning DNS_NODATA
> DNS lookup of mail.lysator.liu.se (A) succeeded
> 130.236.254.3 in "! ::::/0 : ! 85.194.0.0/18 : ! 212.214.126.0/24 : ! 85.8.0.0/20"? yes (end of list)
> ignored host mail.lysator.liu.se [130.236.254.3]
> mail.lysator.liu.se in hosts_treat_as_local? no (end of list)
> fully qualified name = lysator.liu.se
> host_find_bydns yield = HOST_FIND_AGAIN (1); returned hosts:
>   mail.lysator.liu.se <null> MX=10 *
> lookuphost router: defer for holmgren at lysator.liu.se
>   message: host lookup did not complete
> holmgren at lysator.liu.se cannot be resolved at this time:
>   host lookup did not complete
> search_tidyup called
> --------------------------8<------------------------------
> 
> As you can see, there is no hint of DNS problems, so the
> HOST_FIND_AGAIN is very strange. After downgrading to 4.60-1, the
> problem went away.

Nice catch. I'm going to forward this to the exim bugzilla.

> I suspect this might be caused by the fix to bug #342619.

You can find out by trying 4.60-3 and 4.60.4.

Greetings
Marc

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