I found an anwer on how to change the "Welcome to Horde" to your own name but found it not entirely accurate for SME 7.sr2 so here is one that should works.
How to change the name on the logon screen in Webmail
We are going to make a new directory in the templates-custom folder to ensure our changes do not get nixed on restart or upgrade
mkdir -p /etc/e-smith/templates-custom/home/httpd/html/horde/config/registry.php
Next is to copy the base code to the templates custom directory
cp /etc/e-smith/templates/home/httpd/html/horde/config/registry.php/110AppRegistryHorde /etc/e-smith/templates-custom/home/httpd/html/horde/config/registry.php
Edit (vi)
vi /etc/e-smith/templates-custom/home/httpd/html/horde/config/registry.php/110AppRegistryHorde
It should look something like this
// 110AppRegistryHorde
$this->applications['horde'] = array(
'fileroot' => dirname(__FILE__) . '/..',
'webroot' => $webroot,
'initial_page' => 'login.php',
'name' => _("Horde"),
'status' => 'active',
'templates' => dirname(__FILE__) . '/../templates',
'provides' => 'horde'
);
Put your desired name in the name line replacing Horde.
Expand the template by doing
/sbin/e-smith/expand-template /home/httpd/html/horde/config/registry.php
It worked for me. Please let me know if there are any problems or better ways to do this.