what about
# yum update
Loaded plugins: fastestmirror, priorities, protectbase, replace, security
Loading mirror speeds from cached hostfile
* addons: centos.fastbull.org
* base: centos.fastbull.org
* extras: centos.fastbull.org
* kloxo-mr-epel: mirror.de.leaseweb.net
* kloxo-mr-ius: ftp.astral.ro
* updates: centos.fastbull.org
Excluding Packages in global exclude list
Finished
Reducing custom-atomic - atomicrocketturtle.com to included packages only
Finished
Excluding Packages from Kloxo-MR - centalt - x86_64
Finished
Reducing Kloxo-MR - lxcenter - x86_64 to included packages only
Finished
Excluding Packages from Kloxo-MR - release-version-x86_64
Finished
Excluding Packages from Kloxo-MR - release-version-noarch
Finished
0 packages excluded due to repository protections
Skipping security plugin, no data
Setting up Update Process
Resolving Dependencies
Skipping security plugin, no data
--> Running transaction check
---> Package dovecot.x86_64 1:2.1.1-2_132.mr.el5 set to be updated
--> Processing Dependency: systemd for package: dovecot
--> Finished Dependency Resolution
1:dovecot-2.1.1-2_132.mr.el5.x86_64 from kloxo-mr-release-version-arch has depsolving problems
--> Missing Dependency: systemd is needed by package 1:dovecot-2.1.1-2_132.mr.el5.x86_64 (kloxo-mr-release-version-arch)
Error: Missing Dependency: systemd is needed by package 1:dovecot-2.1.1-2_132.mr.el5.x86_64 (kloxo-mr-release-version-arch)
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
!!