[imp] Cant send mails; No Postfix-Login of Horde?

[Michael Lehner]

Hey Community,

I'm a little bit lost in configuration the imp-Part of Horde.

I made a fresh installation of Groupware Edition including imp. I was able to
make the authentication via my IMAP-Server working. I can log in, use all
features - also the Administration part .

But what I'm not able to is sending mails via Horde. When I press Send in the
Composing-Part nothing happens. No sending or an error info after a few
seconds/minutes.

The Horde-Log is just saying this:

2013-05-17T06:13:30+00:00 DEBUG: HORDE [imp] SQL  (0,0001s)
                             SELECT sentmail_recipient, count(*) AS
sentmail_count FROM                         imp_sentmail WHERE sentmail_who =
'michael at lehner-online.net' AND                sentmail_success = 1 AND
sentmail_action in ('new', 'forward',                   'reply', 'redirect')
GROUP BY sentmail_recipient ORDER BY                        sentmail_count DESC
LIMIT 10 [pid 20541 on line 806 of "/usr/share/php /Horde/Db/Adapter/Base.php"]
                                                    2013-05-17T06:13:30+00:00
DEBUG: HORDE [horde] Max memory usage: 6029312 bytes [ pid 20541 on line 555 of
"/usr/share/php/Horde/Registry.php"]
                   2013-05-17T06:13:34+00:00 DEBUG: HORDE Load config file
(conf.php; app: horde) [ pid 20541 on line 148 of
"/usr/share/php/Horde/Core/Factory/Logger.php"]
        2013-05-17T06:13:34+00:00 DEBUG: HORDE Horde_Registry: retrieved app
with cache  ID horde_registry|app|1368690170|5aac2d06267c490ea1584c7cf446397a
[pid 20541 on  line 1983 of "/usr/share/php/Horde/Registry.php"]
                               2013-05-17T06:13:34+00:00 DEBUG: HORDE [imp] Load
config file (nls.php; app: hor de) [pid 20541 on line 480 of
"/usr/share/php/Horde.php"]                        2013-05-17T06:13:34+00:00
DEBUG: HORDE [imp] Load config file (conf.php; app: im p) [pid 20541 on line 480
of "/usr/share/php/Horde.php"]                         2013-05-17T06:13:34+00:00
DEBUG: HORDE [imp] Load config file (hooks.php; app: i mp) [pid 20541 on line
480 of "/usr/share/php/Horde.php"]
                       2013-05-17T06:13:45+00:00 DEBUG: HORDE Load config file
(conf.php; app: horde) [ pid 20890 on line 148 of
"/usr/share/php/Horde/Core/Factory/Logger.php"]

I already tried to put all the necessary credentials in the backends.php of imp
- same behaviour.

At the moment I'm lost and need some advice from you guys.

Any help is greatly appreciated.

Thanks a lot

Michael