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Can you try again with IMP 4.0.4-RC1? At least one of the issues 
should be fixed now.

I also have a custom hook that set's the e-mail adress for the users. 
Preferably I would like to turn of the possiblity that users can 
change they're e-mail adress. However if I do so I also get just 
@domain.com with these mail messages. Even if IMP works fine and send 
out mail correctly. It might be related to my custom hooks.. This 
should probably be a own ticket but here I go:



if (!function_exists('_horde_hook_postauthenticate')) {

      function _horde_hook_postauthenticate($userID, $credential, $realm)

      {

          $name = "$userID";

          if (is_null($name)) {

              $name = Auth::getAuth();

          }

          if (!empty($name)) {

              $users_identities = &Identity::singleton('none',"$name");

              $users_identities->init();

              $users_identity_default_from_addr = 
$users_identities->getValue('from_addr');

              if (empty($users_identity_default_from_addr)) {

                  // use your own algorithm here or at least cahnge te 
domain name to the real value

                  $mail = "$name";

                  // store default identity changes

                  $users_identities->setValue('from_addr',"$mail");

                  $users_identities->save();

              } else {

                  $mail = "$users_identity_default_from_addr";

              }

              // If no email address is found, then the login name will

              // be used.

              return (empty($mail) ? '' : $mail);

          }

          return '';

      }

}





if (!function_exists('_prefs_hook_from_addr')) {

      function _prefs_hook_from_addr($user = null)

      {

          $name = "$userID";

          if (is_null($name)) {

              $name = Auth::getAuth();

          }

          if (!empty($name)) {

              $users_identities = &Identity::singleton('none',"$name");

              $users_identities->init();

              $users_identity_default_from_addr = 
$users_identities->getValue('from_addr');

              if (empty($users_identity_default_from_addr)) {

                  // use your own algorithm here or at least cahnge te 
domain name to the real value

                  $mail = "$name";

                  // store default identity changes

              } else {

                  $mail = "$users_identity_default_from_addr";

              }

              // If no email address is found, then the login name will

              // be used.

              return (empty($mail) ? '' : $mail);

          }

          return '';

      }

}



It looks to complicated for me to have made so I've probably found it 
somewhere on the net or something (don't remember). Kronolith also 
needs the e-mail adress inn horde to be set (and allowed to be changed 
:( ) or else it won't send out notifications to ppl.

(using Horde as it comes with PLESK 7.5.3)

when person A creates a new 'calender' item in Outloud 2000 and have a 
Horde user B attend the meeting, user B will see a email with 
attachement: meeing.ics  [text/calendar]

When users B clicks on this file the meeting can be accepted.



problem #1 Then user A receives an email from 
'@webmail.domainname.com'. User B has to go to the options panel in 
Horde and manually create a profile (identity) and specify the 'sender 
name / email' to fix this.



problem #2 After fixing problem 1 Outlook 2000 does receive an 
accepted update from user B, but in the calender view of Outlook it 
still says that user B has not accepetd.

So it seems Outlook is unable to recognize that it was user B who 
accepted a meeting.