On Wed, Sep 24, 2014 at 12:58:46PM -0400, Postfix wrote: > As it stands today, the mxrelay box is what every box sends mail to > initially, with local mail being sent to the internal mailhost, and > everything else to an upstream MX box that has connectivity (it's third > party not managed by me)
You can/should use the "relay" transport for "inbound" mail, and the "smtp" transport for outbound mail. Appropriate overrides of smtp_generic_maps can be specified in master.cf: master.cf: relay unix ... smtp -o smtp_generic_maps=$relay_generic_maps ... main.cf: relay_generic_maps = ... -- Viktor.