On Fri, Aug 28, 2015 at 04:21:07PM +0000, Wolfe, Robert wrote: > Not sure, but this _MIGHT_ be what you need (YMMV): > > http://www.kutukupret.com/2010/01/02/postfix-bind-sender-domain-to-dedicated-outgoing-ip-address/
I read the OP's message as wanting to use a particular IP address for sending *to* verizon.com (recipient not sender dependent). We don't have a "smtp_bind_address_maps" feature, so this does require a separate "smtp" transport in master.cf. Selecting a transport by the recipient address is how Postfix works normally. -- Viktor.