==== Required information ====
- iRedMail version: 0.8.3
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: CentOS 5.8
- Related log if you're reporting an issue:

--> Finished Dependency Resolution
dovecot-managesieve-0.11.13-0_6.el5.i386 from iRedMail-Dovecot-12 has depsolving problems
  --> Missing Dependency: dovecot >= 1.2 is needed by package dovecot-managesieve-0.11.13-0_6.el5.i386 (iRedMail-Dovecot-12)
php53-common-5.3.3-13.el5_8.i386 from installed has depsolving problems
  --> php53-common conflicts with php-common
5:postfix-perl-scripts-2.5.9-5.ired.i386 from iRedMail has depsolving problems
  --> Missing Dependency: postfix = 5:2.5.9-5.ired is needed by package 5:postfix-perl-scripts-2.5.9-5.ired.i386 (iRedMail)
1:dovecot-sieve-0.1.19-9.1.el5.i386 from iRedMail-Dovecot-12 has depsolving problems
  --> Missing Dependency: dovecot >= 1.2 is needed by package 1:dovecot-sieve-0.1.19-9.1.el5.i386 (iRedMail-Dovecot-12)
Error: php53-common conflicts with php-common
Error: Missing Dependency: dovecot >= 1.2 is needed by package 1:dovecot-sieve-0.1.19-9.1.el5.i386 (iRedMail-Dovecot-12)
Error: Missing Dependency: dovecot >= 1.2 is needed by package dovecot-managesieve-0.11.13-0_6.el5.i386 (iRedMail-Dovecot-12)
Error: Missing Dependency: postfix = 5:2.5.9-5.ired is needed by package 5:postfix-perl-scripts-2.5.9-5.ired.i386 (iRedMail)
You could try using --skip-broken to work around the problem
You could try running: package-cleanup --problems
                        package-cleanup --dupes
                        rpm -Va --nofiles --nodigest

====

I'm getting nowhere. Yeah, i'm a little new to linux
Any ideas on how to fix this?

package-cleanup --problems returns with:

Setting up yum
Reading local RPM database
Processing all local requires
No problems found