Recently I tried to Update Qubito's, but I got the following error:

[root@qubito packages]# yum -y update
Setting up Update Process
Setting up repositories
Reading repository metadata in from local files
Excluding Packages from CentOS-4 - Updates
Finished
Excluding Packages from CentOS-4 - Base
Finished
Excluding Packages from CentOS-4 - Addons
Finished
Excluding Packages from CentOS-4 - Extras
Finished
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Package dovecot.i386 0:1.1.8-0BQ2 set to be updated
--> Running transaction check

Dependencies Resolved

=============================================================================
Package Arch Version Repository Size
=============================================================================
Updating:
dovecot i386 1.1.8-0BQ2 BlueQuartz 3.5 M

Transaction Summary
=============================================================================
Install 0 Package(s)
Update 1 Package(s)
Remove 0 Package(s)
Total download size: 3.5 M
Downloading Packages:
(1/1): dovecot-1.1.8-0BQ2 100% |=========================| 3.5 MB 00:44

Package dovecot-1.1.8-0BQ2.i386.rpm is not signed

http://bluequartz.org/pub/BlueQuartz/5100R/CentOS4/bluequartz/i386/RPMS/dovecot-1.1.8-0BQ2.i386.rpm

That is very strange:

Here is the md5sum:

96b14d9033acf8c6cd0852fbc7cf5292 dovecot-1.0-0.beta8.2.BQ.i386.rpm

So I manually install it: