Hi, I'm in the process of replacing a server running Postfix with Exim, due to obvious reasons. Now I have in principle the following configuration: - smtp-in machine accepts in connections to port 25, runs greylistd, and then forwards the messages forward to a machine. I'm not 100% sure how this was accomplished, and the machine is not in my appartment at the moment, but it was the hubbed.hosts or hubbed_hosts for the hubbed router definition. Anyways, the file has a number of domains, and a smtp server for each domain to send the mail to. This machine cannot connect to port 25 outside on the internet. - mailserver is a machine running Exim, that receives in practice all the hubbed mail from the smtp-in machine, for all domains. This machine delivers the mail to the local machine. - smtp-out is a machine running Exim, which can make connections outbound to port 25, so it can send mail to the outside world. So, my dilemma is this, which I would really appreciate an answer for, how can I convince the smtp-in machine to send the hubbed router stuff _first_, and if something goes wrong, a bounce is sent back to the sender via the smtp-out machine, which acts as a smart host for smtp-in and mailserver? I think that if I do use the smarthost feature without the hubbed router, I will end up in a situation, where the mail starts to just circulate between the smtp-in and smtp-out machines, because smtp-in is MX for the domains, and smtp-out will obviously send there the mail without thinking anything about it.
So, is it possible to force Exim to first act on the hubbed router, and deliver mail straight to a given smtp server, with a direct connection to the port 25, and then if the hubbed router fails, it resorts back to using smtp-out as the smart host for sending mail? If this is possible, how would I go ahead and configure it? I'm new to this list, and I'm really sorry if I asked a FAQ, but google hasn't told me essentially nothing for 2 hours. Thank you, Bo Granlund -- ## List details at http://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/
