Thanks you so much for the quick response
How does one go about doing a query (in particular, for an alias)?
Basically, the need to do a query for an alias (to see where the actual email address where a mail should go to). I found this online: http://www.postfix.org/DATABASE_README.html
I also found this: http://www.postfix.org/mysql_table.5.html
I also saw something like this as a way of querying(?):
postmap -q email@example.com
Given that the information is in the DB, how does one use a postfix utility to query it? The idea was to avoid doing direct queries against the DB (for performance reasons).