Te sugiero que hagas lo siguiente. Primero borra todo el contenido del archivo /home/e-smith/db/yum_repositories
Luego pega este codigo:
# DO NOT MODIFY THIS FILE.
# This file is automatically maintained by the Mitel Networks SME Server
# configuration software. Manually editing this file may put your
# system in an unknown state.
#
# updated: Thu May 3 16:26:16 2007
addons=repository|BaseURL|http://mirror.centos.org/centos/4/addons/$basearch|EnableGroups|no|GPGCheck|yes|MirrorList|http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=addons|Name|CentOS - addons|Visible|no|status|disabled
base=repository|BaseURL|http://mirror.centos.org/centos/4/os/$basearch|EnableGroups|no|Exclude|kernel,kernel-smp,mkinitrd,mdadm,initscripts|GPGCheck|yes|MirrorList|http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os|Name|CentOS - os|Visible|yes|status|enabled
centosplus=repository|BaseURL|http://mirror.centos.org/centos/4/centosplus/$basearch|EnableGroups|no|GPGCheck|yes|MirrorList|http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus|Name|CentOS - centosplus|Visible|yes|status|disabled
contrib=repository|BaseURL|http://mirror.centos.org/centos/4/contrib/$basearch|EnableGroups|no|GPGCheck|yes|MirrorList|http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib|Name|CentOS - contrib|Visible|no|status|disabled
dag=repository|BaseURL|http://apt.sw.be/redhat/el4/en/$basearch/dag|EnableGroups|no|Exclude|freetype,htop,iptraf,rsync,syslinux|GPGCheck|yes|GPGKey|http://dag.wieers.com/packages/RPM-GPG-KEY.dag.txt|Name|Dag - EL4|Visible|no|status|disabled
dungog=repository|BaseURL|http://sme.dungog.net/packages/smeserver/7.0/i386/dungog/|EnableGroups|yes|GPGCheck|no|Name|SME Server 7 - dungog|Visible|yes|status|enabled
extras=repository|BaseURL|http://mirror.centos.org/centos/4/extras/$basearch|EnableGroups|no|GPGCheck|yes|MirrorList|http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras|Name|CentOS - extras|Visible|no|status|disabled
rpmforge=repository|BaseURL|http://apt.sw.be/redhat/el4/en//dag|EnableGroups|yes|GPGCheck|no|MirrorList|http://apt.sw.be/redhat/el4/en/mirrors-rpmforge|Name|rpmforge|Visible|yes|status|disabled
rvandenaker-cups=repository|BaseURL|http://mirror.contribs.org/smeserver/contribs/rvandenaker/testing/smeserver-cups/repositories/7.0/|EnableGroups|yes|GPGCheck|no|Name|rvandenaker-cups-repository|Visible|no|status|disabled
smeaddons=repository|BaseURL|http://mirror.contribs.org/smeserver/releases/7/smeaddons/$basearch|EnableGroups|yes|GPGCheck|yes|MirrorList|file:///etc/yum.repos.d/mirrors-smeaddons|Name|SME Server - addons|Visible|yes|status|enabled
smedev=repository|BaseURL|http://mirror.contribs.org/smeserver/releases/7/smedev/$basearch|EnableGroups|yes|GPGCheck|yes|MirrorList|file:///etc/yum.repos.d/mirrors-smedev|Name|SME Server - dev|Visible|no|status|disabled
smeos=repository|BaseURL|http://mirror.contribs.org/smeserver/releases/7/smeos/$basearch|EnableGroups|yes|GPGCheck|yes|MirrorList|file:///etc/yum.repos.d/mirrors-smeos|Name|SME Server - os|Visible|yes|status|enabled
smetest=repository|BaseURL|http://mirror.contribs.org/smeserver/releases/7/smetest/$basearch|EnableGroups|yes|GPGCheck|yes|MirrorList|file:///etc/yum.repos.d/mirrors-smetest|Name|SME Server - test|Visible|no|status|disabled
smeupdates=repository|BaseURL|http://mirror.contribs.org/smeserver/releases/7/smeupdates/$basearch|EnableGroups|yes|GPGCheck|yes|MirrorList|file:///etc/yum.repos.d/mirrors-smeupdates|Name|SME Server - updates|Visible|yes|status|enabled
smeupdates-testing=repository|BaseURL|http://mirror.contribs.org/smeserver/releases/7/smeupdates-testing/$basearch|EnableGroups|yes|GPGCheck|yes|MirrorList|file:///etc/yum.repos.d/mirrors-smeupdates-testing|Name|SME Server - updates testing|Visible|yes|status|disabled
snetram=repository|BaseURL|http://www.snetram.nl/yum/|EnableGroups|no|GPGCheck|no|MirrorList|http://mirror.contribs.org/smeserver/contribs/jmartens/mirrorlist|Name|repository@snetram.nl|Visible|yes|status|disabled
updates=repository|BaseURL|http://mirror.centos.org/centos/4/updates/$basearch|EnableGroups|no|Exclude|kernel,kernel-smp,mkinitrd,mdadm,initscripts|GPGCheck|yes|MirrorList|http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates|Name|CentOS - updates|Visible|yes|status|enabled
Luego expande la configuracion:
expand-template /etc/yum.conf
Luego limpia las caches de yum:
yum clean all
y finalmente:
yum update
Cuentanos los resultados