[Exim] Fail over router on defer

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With the following standard router below I am looking to move on to the next router or a specified router when a deferral of a message occurs at the smtp level.



Per the documentation, smtp does its own refer handling and I have been unable to locate or come up with any idea that would work.



If this is not possible at the time of refer then I would like to set a condition that a message has been deferred in the past so that a router before dnslookup: could handle the message rather than dnslookup below.



Ultimately I am looking to use the manualroute driver to gateway my mail to another SMTP server should a defer occur at the smtp level.



Standard default dnslookup router below:



dnslookup:
driver = dnslookup
domains = ! +local_domains
transport = remote_smtp
ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
no_more





Best regards,






Bryan


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