[horde] imp-can not send mail

[Santhosh Kumar A]

I have  installed horde3.1.7.I can conect to horde .When I try to send mail, it shows te following error.

"There was an error sending your message: Failed to connect to localhost:25 [SMTP: Invalid response code received from server (code: 451, response: Temporary local problem - please try later)]"

When i checked the horde log, it showed the following error.

"Apr 13 21:13:12 HORDE [error] [imp] Failed to connect to localhost:25 [SMTP: Invalid response code received from server (code: 451, response: Temporary local problem - please try later)] [on line 1059 of "/usr/share/horde/imp/compose.php"]
Apr 13 21:13:12 HORDE [debug] [horde] SQL Query by SessionHandler_mysql::read(): query = "SELECT session_data FROM horde_sessionhandler WHERE session_id = 'rooich0eqtsntihoj3q83e03j0' AND session_lastmodified > 1240067952 FOR UPDATE" [on line 105 of "/usr/share/horde/lib/Horde/SessionHandler/mysql.php"]"
 I am struck up with the installation.
My configuration file is 


nf['debug_level'] = E_ALL;
$conf['debug_level'] = debug;
$conf['max_exec_time'] = 0;
$conf['compress_pages'] = true;
$conf['umask'] = 077;
$conf['use_ssl'] = 2;
$conf['server']['name'] = $_SERVER['SERVER_NAME'];
$conf['server']['port'] = $_SERVER['SERVER_PORT'];
$conf['session']['name'] = 'Horde';
$conf['session']['use_only_cookies'] = true;
$conf['session']['cache_limiter'] = 'nocache';
$conf['session']['timeout'] = 0;
$conf['cookie']['domain'] = $_SERVER['SERVER_NAME'];
$conf['cookie']['path'] = '/';
$conf['sql']['username'] = 'horde';
$conf['sql']['password'] = 'hordepassword';
$conf['sql']['socket'] = '/var/lib/mysql/mysql.sock';
$conf['sql']['protocol'] = 'unix';
$conf['sql']['database'] = 'horde';
$conf['sql']['charset'] = 'iso-8859-1';
$conf['sql']['phptype'] = 'mysqli';
$conf['auth']['admins'] = array('Administrator', 'ask at ksfe.com');
$conf['auth']['checkip'] = true;
$conf['auth']['checkbrowser'] = true;
$conf['auth']['alternate_login'] = false;
$conf['auth']['redirect_on_logout'] = false;
$conf['auth']['params']['driverconfig'] = 'horde';
$conf['auth']['params']['table'] = 'horde_users';
$conf['auth']['params']['username_field'] = 'user_uid';
$conf['auth']['params']['password_field'] = 'user_pass';
$conf['auth']['params']['encryption'] = 'md5-hex';
$conf['auth']['params']['show_encryption'] = false;
$conf['auth']['driver'] = 'sql';
$conf['signup']['allow'] = false;
//$conf['log']['priority'] = PEAR_LOG_NOTICE;
$conf['log']['priority'] = LOG_DEBUG;
$conf['log']['ident'] = 'HORDE';
$conf['log']['params'] = array();
$conf['log']['name'] = '/tmp/horde.log';
$conf['log']['params']['append'] = true;
$conf['log']['type'] = 'file';
$conf['log']['enabled'] = true;
$conf['log_accesskeys'] = false;
$conf['prefs']['params']['driverconfig'] = 'horde';
$conf['prefs']['driver'] = 'sql';
$conf['datatree']['params']['driverconfig'] = 'horde';
$conf['datatree']['driver'] = 'sql';
$conf['group']['driver'] = 'datatree';
$conf['cache']['default_lifetime'] = 1800;
$conf['cache']['params']['dir'] = Horde::getTempDir();
$conf['cache']['params']['gc'] = 86400;
$conf['cache']['driver'] = 'file';
$conf['token']['driver'] = 'none';
$conf['mailer']['params']['auth'] = '0';
$conf['mailer']['type'] = 'smtp';
$conf['vfs']['params']['driverconfig'] = 'horde';
$conf['vfs']['type'] = 'sql';
$conf['sessionhandler']['params']['persistent'] = false;
$conf['sessionhandler']['params']['rowlocking'] = true;
$conf['sessionhandler']['params']['socket'] = '/var/lib/mysql/mysql.sock';
$conf['sessionhandler']['params']['protocol'] = 'unix';
$conf['sessionhandler']['params']['hostspec'] = 'localhost';
$conf['sessionhandler']['params']['username'] = 'horde';
$conf['sessionhandler']['params']['password'] = 'hordepassword';
$conf['sessionhandler']['params']['database'] = 'horde';
$conf['sessionhandler']['type'] = 'mysql';
$conf['problems']['email'] = 'webmaster at ksfe.com';
$conf['problems']['maildomain'] = 'ksfe.com';
$conf['problems']['tickets'] = false;
$conf['menu']['apps'] = array();
$conf['menu']['always'] = true;
$conf['menu']['links']['help'] = 'authenticated';
$conf['menu']['links']['help_about'] = true;
$conf['menu']['links']['options'] = 'authenticated';
$conf['menu']['links']['problem'] = 'never';
$conf['menu']['links']['login'] = 'all';
$conf['menu']['links']['logout'] = 'authenticated';
$conf['hooks']['permsdenied'] = false;
$conf['hooks']['username'] = false;
$conf['hooks']['preauthenticate'] = false;
$conf['hooks']['postauthenticate'] = false;
$conf['hooks']['authldap'] = false;
$conf['portal']['fixed_blocks'] = array();
$conf['accounts']['driver'] = 'null';
$conf['imsp']['enabled'] = false;
$conf['kolab']['enabled'] = false;

Pls help me to settle this problem.

Thanks in advance




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