On 2011-10-09 at 20:43 +0200, Fabien LUCE wrote: > What I have mainly understood is firstly that when a mail server is > looking for an external domain, a dnslookup router is looking for the > highest priority MX or SRV entry of my domain zone file... it can only > look for an A entry if nothing else exists.
Roughly correct, although SRV records are _not_ used by default, and what matters is the published DNS, not whatever is currently in your file on disk (it matters if you break replication). > To set à backup mail server, another MX entry with lower priority should > be written in the zone file. Correct. > And now I can install a second exim on a friend's machine (Sb as Server > B). > The first configuration I have thought: I tell Sb to respond for mydomain.org > (in the domainlist) and configure routers to send to mydomain.org (with a > dnslookup or manual router). Thus, my mail will be sent to my "master" server > in a time defined by the "retry" part of my configuration file. > And nothing else, even not any local delivery. > > Do you think it should work? That is how things used to be done, but I strongly advise against doing that for any new deployment today. You need to think about how you deal with spammers and what happens to messages going to left-hand-sides that don't exist and whether or not you would be generating "back-scatter"; backscatter is bounces to fraudulently used addresses, because you accepted responsibility for a faked message and sending bounces, instead of rejecting at SMTP time so that responsibility remained with the sender. -Phil -- ## 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/
