[Dovecot] help with dovecot installation dependencies

[sunhux G]

I'm on RHES 4.x

I downloaded 2 dovecot RPM packages from
 http://packages.sw.be/dovecot/

dovecot-1.0.13-1.el4.rfx.i386.rpm       13-Nov-2010 22:15  1.8M  RHEL4 and
CentOS-4 x86 32bit
   and
dovecot-0.99.13-1.2.el4.test.i386.rpm   21-Feb-2005 16:57  693K  RHEL4 and
CentOS-4 x86 32bit

The first rpm fails with error below :
# rpm -i ./dovecot-1.0.13-1.el4.rfx.i386.rpm
warning: ./dovecot-1.0.13-1.el4.rfx.i386.rpm: V3 DSA signature: NOKEY, key
ID 6b8d79e6
error: Failed dependencies:
        libmysqlclient.so.14(libmysqlclient_14) is needed by
dovecot-1.0.13-1.el4.rfx.i386

I have a hard time trying to locate an rpm that contains
libmysqlclient.so.14
& have no luck :
# rpm -i ./mysql-libs-5.1.42-4.el6.i686.rpm
warning: ./mysql-libs-5.1.42-4.el6.i686.rpm: V3 RSA/MD5 signature: NOKEY,
key ID f21541eb
error: Failed dependencies:
        libcrypto.so.10 is needed by mysql-libs-5.1.42-4.el6.i686
        libssl.so.10 is needed by mysql-libs-5.1.42-4.el6.i686
        rpmlib(FileDigests) <= 4.6.0-1 is needed by
mysql-libs-5.1.42-4.el6.i686
        rtld(GNU_HASH) is needed by mysql-libs-5.1.42-4.el6.i686
        rpmlib(PayloadIsXz) <= 5.2-1 is needed by
mysql-libs-5.1.42-4.el6.i686


Then I installed the 2nd dovecot rpm successfully but its filename indicated
it's a "test" version :

# rpm -i ./dovecot-0.99.13-1.2.el4.test.i386.rpm
warning: ./dovecot-0.99.13-1.2.el4.test.i386.rpm: V3 DSA signature: NOKEY,
key ID 6b8d79e6

# /etc/init.d/dovecot start
Starting IMAP daemon (dovecot):                            [  OK  ]


Q1:
Is the test version rpm  of dovecot reliable?  It's only half the size of
the other rpm (that I was not able to install)

Q2:
Kindly assist me to resolve the 1st rpm issue : let me know where I
can download the dependencies etc


Q3:
Lastly, kindly point me to a simple doc that tells me how to
do basic setup of dovecot & create simple mailbox accounts. I'm a
 complete newbie to dovecot & postfix.  Have some Linux know-how