Thanks for your reply Jeff.
That is the problem. I know that most of the letters have content.
I also tried to send mails to non existent mail accounts for several domains on the server by my selves. These mails is full of content and they are harmless, should not be stopped by spam detecting software. The only thing that should happen, is that the mails should be bounced but when I open the mail in the list, it contain no Body Chunk at all.
It's no problem with mail in general. Mail are sent, received and filtered by Spamblocker3. The only thing is that I can not see the content when I open the mail in the list.
Well, it's not critical, so I will look a little bit around. Thanks for your help Jeff and happy Christmas to you and everyone else in the community.