imap problem

Ladislav Slanina <[email protected]>
Newsgroups gmane.comp.kde.devel.kroupware
Message-ID <38341138.EAOMUgg6aC@zbook> 
Hi everybody.

Can somebody kick me to correct way? 
When I would like to send email from WEB GUI I get message: ERROR: SMTP ERROR: 
[554] 5.7.1 <DATA>> Data command rejected: Unverifiable sender.

The same messag I discovered in maillog for Outlook comunication. Whole 
traffic stop! May I ask for some fast advice, please?

Greetings, ladas
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