>Does newaliases/sendmail require that aliases files reside in /etc?
>Or, can they be located other places?

provided that nothing else *expects* it to be in /etc, you can always
change the /etc/sendmail.cf from this:

   # location of alias file
   O AliasFile=/etc/aliases

to this:

   # location of alias file
   O AliasFile=/some/place/else/aliases

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