On 19/01/18 10:33, Urs Janßen wrote: > after switching to a new upstream mailprovider we see tons of > "T=remote_smtp defer (-53): no host found for existing SMTP connection" > in our log, comming from a manual router which passes all remaining > mails to the provider: > > send_to_gateway: > driver = manualroute > transport = remote_smtp > route_list = * smtp.provider.example > > smtp.provider.example usualy resolves to a _different_ A record on each dns > query (4-5 in total) but does NOT do dns round robin (does not return a list > of records but a single entry each time). > > Any ideas how to fix this issue on our side?
More of a workaround than a fix (it reduces efficiency) - try setting connection_max_messages = 1 on the transport. Alternatively, use a caching DNS resolver to proxy your DNS lookups. -- Cheers, Jeremy -- ## 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/
