> On Dec 12, 2018, at 2:48 PM, Daniel Miller <dmil...@amfes.com> wrote:
> 
> Not wanting to get in the way of the experts but this may help:

Indeed a nice succinct and accessible answer for non-experts.  Please
don't hesitate to post similarly helpful replies.

> An oversimplified view of the transport map is it tells Postfix what line in 
> master.cf to use for a given recipient domain (or full address).  There's 
> only one transport map but it can have several lines for individual decisions.
> 
> Wietse's email told you to perform a command-line test to verify your 
> transport map is setup correctly.  So do that first.
> 
> The definitions in master.cf tell Postfix where to listen and where to send 
> the message.  So with an explicit transport mapping, using master.cf you 
> provide explicit overrides to the defaults or global settings from main.cf.  
> So if the only "special" behavior you need for the exchange transport is no 
> sasl: 
> 
> exchange  unix -       -       n       -       -       smtp
>  -o smtp_sender_dependent_authentication=no

-- 
        Viktor.

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