> With all the problems that I'm having with my Postfix setup, I am taking a 
> deeper dive into the meaning of each parameter declaration.
> Is it necessary to declare "alias_maps" in the main.cf or does it have a 
> default file path that it looks to or does it just not look at alias_maps if 
> not declared?

See http://www.postfix.org/postconf.5.html#alias_maps

alias_maps (default: see "postconf -d" output)

[root@server ~]# postconf -d | grep alias_maps
alias_maps = hash:/etc/aliases, nis:mail.aliases

On my server the default is /etc/aliases, even if not defined in main.cf.

Best regards
Gerald

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