[CentOS] postfix and dovecot package with mysql support?

Where can I get the src.rpm for the postfix and dovecot package and
rebuild to add mysql support?
The postfix and dovecot package for centos4 does not come with mysql
support and I cant find the .src.rpm on the 4 CDs I have for CentOS4.
Also, what parameter should I add ?
rpmbuild --rebuild --with MySQL ? or something else?

Thanks,

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Erick Perez
Linux User 376588
http://counter.li.org/  (Get counted!!!)
Panama, Republic of Panama