Hi,
Would it be a good idea to list all forbidden characters during installation?
We reinstalled iredmail 5 times and everytime it had the same error.
After installation we had a database connection error.
And none of the tables where created.
With attempt 4 I noticed a database connection error during the setup script.
And yes, we used a # (pound symbol) in the mysql password !!!
With attempt 5 we omitted the # in the password and a few minutes later we had a working server 
Regards,
Emiel.