[horde] Message send failed: Error connecting to SMTP server

[Luboš]

Hi, 
I have trouble with Egroupware which is using from version 14.2 
Horde_Smtp. Everything was working fine until I did upgrade from
EGW 14.1 with phpMailer to 14.2 with Horde_Smtp.

Now I can't send mail. Always got this error in EGW aplication.
"Message send failed: Error connecting to SMTP server."

And in Apache2 error.log these errors.

[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] An error happened
(Horde_Mime_Exception): Error connecting to SMTP server., referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=
[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] #0
/usr/share/php/Horde/Mime/Mail.php(479):
Horde_Mime_Part->send('ambruska at seznam...', Object(Horde_Mime_Headers),
Object(Horde_Mail_Transport_Smtphorde)), referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=
[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] #1
/usr/share/egroupware/phpgwapi/inc/class.egw_mailer.inc.php(389):
Horde_Mime_Mail->send(Object(Horde_Mail_Transport_Smtphorde), true),
referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=
[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] #2
/usr/share/egroupware/mail/inc/class.mail_compose.inc.php(2641):
egw_mailer->send(), referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=
[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] #3
/usr/share/egroupware/mail/inc/class.mail_compose.inc.php(292):
mail_compose->send(Array), referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=
[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] #4 [internal
function]: mail_compose->compose(Array), referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=
[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] #5
/usr/share/egroupware/phpgwapi/inc/common_functions.inc.php(1047):
call_user_func(Array, Array), referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=
[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] #6
/usr/share/egroupware/etemplate/inc/class.etemplate_new.inc.php(315):
ExecMethod('mail.mail_compo...', Array), referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=
[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] #7
/usr/share/egroupware/mail/inc/class.mail_compose.inc.php(3113):
etemplate_new::ajax_process_content('mail_maly_54b4f...', Array, false),
referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=
[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] #8 [internal
function]: mail_compose::ajax_send('mail_maly_54b4f...', Array, false),
referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=
[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] #9
/usr/share/egroupware/phpgwapi/inc/class.egw_json.inc.php(163):
call_user_func_array(Array, Array), referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=
[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] #10
/usr/share/egroupware/phpgwapi/inc/class.egw_json.inc.php(82):
egw_json_request->handleRequest('mail_compose::a...', Array), referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=
[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] #11
/usr/share/egroupware/json.php(105):
egw_json_request->parseRequest('mail_compose::a...', '{"request":{"pa...'),
referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=
[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] #12 {main},
referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=
[Tue Jan 13 12:01:52 2015] [error] [client 192.168.0.240] #
Instance=default, User=maly, Request=POST
http://192.168.0.204/egroupware/json.php?menuaction=mail_compose::ajax_send,
User-agent=Mozilla/5.0 (Windows NT 6.1; WOW64; rv:29.0) Gecko/20100101
Firefox/29.0, referer:
http://192.168.0.204/egroupware/index.php?menuaction=mail.mail_compose.compose&id=

I spent days, weeks to try solve my problem, but with no success. And I do
not know what else to try.
So I need some one who knows what these errors in apache2 error.log means
and is willing to help me.

I appreciate any hint,tip or whatever.
Thanks

Lubos