Blat and -f option not working

"[email protected] [blat]" <[email protected]>
Newsgroups gmane.mail.blat
Message-ID <[email protected]>
Hi there, i am using Blat 323 and got a problem with the sender adress. I use blat via stunnel to send my emails via securesmtp.-tonline.de.
 

 I got no problems sending the emails but i simply can´t get blat to work with the option -f.
 

 Everytime it uses the email adress i use to log in to the server. 
 

 Anny suggestions how to change the sender adress ?
 

 Example:
 

 login : [email protected]
 sender using -f : [email protected]
 

 Emails states the sender is [email protected]
 

 Thanks in advance.
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