2009/4/17 LuKreme <[email protected]>: > I have a LAN with several computers on it used by a variety of users. I > have one server on the LAN running OS X and have postfix installed (probably > needs updating, but not gotten that far). What I want to do is to have users > on the LAN send emails to other users on the LAN ([email protected]) and > have those email addresses mapped to specific addresses on the remote server > ([email protected], served by mail.example.com). > > I do not want the users to be able to send mail via example.local to any > other users but those that I have mapped, and I do not want to accept any > mail from outside the LAN for [email protected], but might want accept mail > for local users if they are sent to the outward facing rdns for the machine > (say [email protected]). > > So, i have a user bob who sends email to [email protected] and my LAN's DNS > points example.local's MX record to 10.11.12.13, and then postfix gets that > mail, remaps it to [email protected] and sends it out via a connection to > mail.example.com. if bob tries to send to [email protected] and there is no > map, the user is rejected. If bob tries to send to [email protected] via the > LAN postfix, it is rejected. 10.11.12.13's postfix will ONLY send to > mail.example.com and only for users in the map. > > The question is, what is the best way to ensure that this works. What is > the best map to use, and am I forgetting anything obvious?
Would hosting example.local as a virtual alias domain do the job? Assuming no other configuration, postfix will accept mail locally for $mydestination, and for virtual_alias_domains. Then just list the acceptable recipients in virtual_alias_maps. These requirements of "may/may-not send to arbitrary-domain.com depending on the connecting interface" sound troublesome, but I'm sure someone here has a solution.
