This is the problem:
Apr 14 00:57:44 cl-t022-500cl postfix/proxymap: warning: connect to mysql server 127.0.0.1: Access denied for user 'mail_admin'@'localhost' (using password: YES)
Make sure you use the correct password for the mail_admin user.
What's the result of
SELECT * FROM user WHERE User = 'mail_admin';
(must be run in the mysql database)?