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My Postfix daemon sometimes keeps a day's mail in its queue with errors like

15F0C64ADD     7422 Fri Sep  9 07:59:31  [email protected]
(delivery temporarily suspended: Host or domain name not found. Name service error for name=smtp.teksavvy.com type=AAAA: Host not found, try again)
                                     [email protected]

Thing is: host smtp.teksavvy.com gives me perfectly valid IP address. The above message is due to an earlier problem (DSL connection down, typically) that was fixed hours ago. postqueue -f does not help. If I stop and restart the Postfix daemon, things do clear up, however.

How can I get Postfix to clear up the queue without manual intervention (and more quickly than at the end of the day), other than by forcing constant stops&restarts?

In Delivery temporarily suspended: Host or domain name not found, the user runs postqueue -f when he reconnects to the network, but in my case the machine is always up and has "always" access to the network (obviously, except for when there's a problem upstream), so it would not know when to run postqueue -f.

In any case, running postqueue -f does not help: those email stay in the queue with the same "Host or domain name not found" error, even though the transient DNS error has been fixed long ago. Should I report it as a Postfix bug?

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FWIW, the problem in my case turned out to be that Postfix is setup to run in a chroot (this is standard Postfix setup in Debian testing) and that the /etc/resolv.conf file in the chroot was not automatically kept in sync with the main one. I fixed the problem by installing the resolvconf package (which runs the hooks that were expected to be used to keep the file in sync).

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