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http://bugs.exim.org/show_bug.cgi?id=815
Summary: Fallback fials if DNS fails
Product: Exim
Version: 4.69
Platform: Other
OS/Version: Windows
Status: NEW
Severity: bug
Priority: medium
Component: Routing
AssignedTo: nigel@???
ReportedBy: marc@???
CC: exim-dev@???
Consider the folowing router:
process_and_forward:
driver = manualroute
domains = +preprocess_domains
transport = process_and_forward_smtp
route_list = *
${lookup{$domain}dbm{/etc/exim/control/run/preprocess.db}{$value}{}}
fallback_hosts = retry.ctyme.com
no_more
If the receiving server fails the message is forwarded to the fallback_hosts
server. However suppose the domain is example.com and the DBM file points to
forward to mail.example.com - but the host mail.example.com fails to resolve.
In this case the message is NOT forwarded to the fallback server.
I think this is a bug and that a DNS failure should cause the fallback
condition to execute.
This is important to me because I'm using a ram disk for the email queues on my
main server for speed. But what I want to do with this server is try to forward
one time and if there is any failure to lateral the message off to the retry
server that does store the queue on hard disk and will retry for 4 days.
What happens on DNS failure is that email gets stuck in the queue and starts
filling up ram disk. I do have 8 gigs of ram and it hasn't yet been a problem.
But I don't want to store email in ram beyond a single delivery try.
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