I run a cluster of four Exim servers, running an older install of Exim 4. All of a sudden, today, all four have suddenly started responding to every message received via SMTP with "451 - temporary local problem" and the log shows "temporarily rejected RCPT <user@domain>". There's no detail on the end of the line to explain why the address has been rejected.
I know from googling that these issues are usually caused by DNS problems, however exhaustive tests can find no problem with the DNS on these machines. Each one runs a local resolver, and the resolv.conf files on each machine are set to query the local DNS, then another local general-purpose DNS server in our network, and then the Google public DNS as a fallback. The machines can reach all three nameservers, and the "host" command resolves the domains that are being rejected properly. Anyone got any idea what might be wrong, or how to debug it? >From something I saw on a forum I tried running exim -d on some of the failed addresses. This gets to the 'search_tidyup called' line, where it hangs and eventually times out with "exim: timed out while reading - message abandoned" - J. -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
