[Tickets #7978] problem sending mail - blank white screen

[bugs at horde.org]

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Ticket URL: http://bugs.horde.org/ticket/7978
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  Ticket             | 7978
  Created By         | st at fdf.dk
  Summary            | problem sending mail - blank white screen
  Queue              | IMP
  Version            | 4.3.2
  Type               | Bug
  State              | Unconfirmed
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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st at fdf.dk (2009-02-12 17:17) wrote:

The basic for my installation is a SME server 7.4 with imp 4.3.2.
After installing/adding kronolith, nag and gollem, I have a problem  
sending a e-mail.
When I send the e-mail I get a blank white screen.
The only way out is to close the window and thereby the e-mail is not send.

My message log says:
Feb 12 23:13:27 dothilde httpd: PHP Warning:   
Mail_smtp::include_once(Net/SMTP.php) [<a  
href='function.Mail-smtp-include-once'>function.Mail-smtp-include-once</a>]:  
failed to open stream: Ingen sådan fil eller filkatalog in  
/usr/share/pear-addons/Mail/smtp.php on line 148
Feb 12 23:13:27 dothilde httpd: PHP Warning:   
Mail_smtp::include_once() [<a  
href='function.include'>function.include</a>]: Failed opening  
'Net/SMTP.php' for inclusion  
(include_path='/home/httpd/html/horde/lib:/usr/share/pear-addons:/usr/share/pear') in /usr/share/pear-addons/Mail/smtp.php on line  
148
Feb 12 23:13:27 dothilde httpd: PHP Fatal error:  Class 'Net_SMTP' not  
found in /usr/share/pear-addons/Mail/smtp.php on line 150

I searched a lot of sites and can't find a solution on this problem, I  
You need more information please say..

regards
Soren