[CentOS] Cyrus firstname.lastname at domain

I'm converting an environment from mandrake to centos, and always try to 
use the applications standard on the distribution. This means a switch 
from courier to cyrus.

A bit of reading uncovered a potential problem - the site uses 
firstname.lastname at domain, and I have come across references that Cyrus 
does not support this. I couldn't find this limitation in the Cyrus 
documentation.

Is it true?

regards Dave
www.hornfordassociates.com