Stephen Liu wrote:
> I have a /etc/postfix/mysql_*.cf file with following content;

You haven't told us what this file is called. We dunno what it does, we
have no way to tell.

> user=mail
> password=mypasswd
> dbname=maildb
> table='t'
> select_field=domains
> where_field=domains
> hosts=127.0.0.1
> additional_conditions = and enabled = 1

At a guess, it's going to perform the query:
SELECT `domains` FROM `t` WHERE `domains`=%s AND `enabled`=1;

It could be virtual alias domains, it could be anything.
http://www.postfix.org/mysql_table.5.html

> Please help me to understand table='t'.  What is 't'?


As the file says, 't' is the name of the table it's going to SELECT from.

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