strange char in the header

"ml2" <[email protected]>
Newsgroups gmane.mail.sqwebmail
Message-ID <[email protected]> 
Dear all, 

I have tested sqwebmail 4.0.1 again.  I sent two messages in two different 
accounts and got the follwing headers: 

Return-Path:  <[email protected]>
Delivered-To:  [email protected] 

Return-Path:  <"?C@?C@il"@ezrs.com>
Delivered-To:  [email protected] 

The question is why there is some strange char in the second account but not 
in the first one?
I don't have this problem in sqwebmail 3.6.2. 

Any help is appreciated. 

Regards,
Mick.
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