https://bugs.exim.org/show_bug.cgi?id=2408
--- Comment #2 from David Carter <dpc22@???> ---
(In reply to Jeremy Harris from comment #1)
> > lookup of host "ms1.ad.csx.cam.ac.uk" failed in internal_redirect_two router
>
> Do you have a router named "internal_redirect_two" in your configuration?
Yes, and it appears to be working correctly for other email addresses where the
target domain is correct.
Probably way more detail than you want or need right now:
uis.cam.ac.uk is effectively a large alias file, but the expansions can contain
tokens which redirect email onto other hosts without exposing the internal
names.
For example:
lapwing:lapwing@???
Relevant clauses from our Exim configure file, which relate to these
"internal_redirect" tokens:
DB = /opt/exim-4.92-0.el7/etc/db
domainlist internal_redirect = cdb;DB/internal_redirect.cdb
# The following router expands addresses which are then processed by
# internal_redirect_one and internal_redirect_two:
virtual_aliases:
driver = redirect
domains = +virtual_domains
local_parts = cdb;DOMAINS/db/${domain}.cdb # Includes
uis.cam.ac.uk
address_data = internal=yes
data = $local_part_data
forbid_blackhole
forbid_file
forbid_include
forbid_pipe
check_ancestor
# Verify addresses later processed by internal_redirect_two router
# (inout => after internal_redirect_one has expanded MMD internal_redirects)
internal_redirect_one:
driver = redirect
domains = +internal_redirect
condition = ${extract {internal}{$address_data} }
data = ${quote_local_part:$local_part}@${extract
{domain}{$domain_data} }
address_data = $domain_data inout=yes
# Second stage: route to external host.
internal_redirect_two:
driver = manualroute
condition = ${extract {inout}{$address_data} }
route_data = ${extract {target}{$address_data} } bydns
host_find_failed = defer
self = fail
transport = smtp
where /opt/exim-4.92-0.el7/etc/db/internal_redirect.cdb contains:
ad.cam.internal-redirect domain=uis.cam.ac.uk target=ms1.ad.csx.cam.ac.uk
uis-admin.internal-redirect domain=uis.cam.ac.uk
target=mailgate.admin.cam.ac.uk
the key/value pairs stored in that file haven't changed:
$ md5sum /opt/exim-4.91-0.el7/etc/db/internal_redirect.cdb
/opt/exim-4.92-0.el7/etc/db/internal_redirect.cdb
27ccf5bbd7ad7936971fcd6d83419236
/opt/exim-4.91-0.el7/etc/db/internal_redirect.cdb
27ccf5bbd7ad7936971fcd6d83419236
/opt/exim-4.92-0.el7/etc/db/internal_redirect.cdb
(all installed by Ansible).
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