On Sat, Jul 01, 2017 at 11:42:30AM -0700, wa6vvv wrote:
> I think I have it working now.  Typos are killers.  I added 
> @lafn.org to each of the keys in the virtual_alias_maps file.  That 
> seems to have worked.  I am not sure why I needed (or if I needed) 
> the virtual_mailbox_domains table.
> 
> I did notice there were no entries for [second_domain] in 
> virtual_alias_maps.  Those are all locally delivered so I assumed 
> they were not necessary.  I am receiving mail for that domain 
> without them.
> 
> I have found the diagrams in the documentation quite helpful in 
> understanding postfix.  However, is there similar information on 
> how the various tables are used and in which order?

Postfix has four "address classes" for receiving mail (for which 
Postfix is either the final destination or an intermediate MX), and 
these classes and the lookups they need/use are documented here:

http://www.postfix.org/ADDRESS_CLASS_README.html

Not a diagram, but it does have the answers to your questions.
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