It would be helpful if you posted your code, using  <code> tags. I can then get an idea of where you are going wrong.

How are you using the -f switch? It seems to me all you need to do is use 
-f sender

[download]
and you're fine.

Azatoth a.k.a Captain Whiplash

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In reply to Re: Setting the return path in Sendmail by azatoth
in thread Setting the return path in Sendmail by Anonymous Monk

Title:
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