Not permitted sending reply reasons - based on MySQL

Dear Group,

I've configured Exim 4.64 with MySQL user authorization, and I have
an idea, which I'm not totally sure, whether it's possible to be
done. Each user, has "user status" Boolean (if true, you may login
and email is routed, if false, you receive login fail) stored in the
database table. The idea is that I'd like to send an additional
message (depending on other than Boolean user status - i.e. int32) if
account is locked. Example procedure of locked account e-mail sending
should be like the following:

1. User clicks "send message".
2. User is successfully authorized by MySQL module in exim.
3. User status is checked from database, and if it's 0, relay is not
permitted, if status is bigger than 1, user receive reply email from
"server administrator" with an error message - depended on lock
status reason - and e-mail is not relayed, and finally if status is
equal 1, relay is permitted and e-mail is routed.

I'm wondering, shall I create some dynamic exim filter, or is it
possible to do it in exim.conf file in defined section.

Please do me a favor, and help me finding a solution for my problem.

All the best,
Przemek M. Zawada