Smtpd problem - host not found / "yes" in email

[Anders V�nnman]

Hi,

I have a strange problem. When sending email from Outlook Express to Qmail I
get "host not found" for known hosts, not always, but it seems to be rather
frequent. And second - qmail smtpd (or what it could be) appends "yes"
emails-addresses:

A mail message could not be sent because the following host is unknown:

        nyavf.seyes

 To:    <[EMAIL PROTECTED]>
      From:     <[EMAIL PROTECTED]>
      Subject:  

sometimes it rewrites the email like this:      telia.somyes, should be
"telia.com"... 

Havent got any clue...