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From: Hrvoje Niksic <hniksic@iskon.hr>
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Subject: sendmail -f: evil or not?
Date: 06 Dec 1999 18:31:25 +0100
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My mails come out with an "authentication warning" header that says:

 X-Authentication-Warning: mraz.iskon.hr: hniksic set sender to hniksic@iskon.hr using -f

Why is sendmail complaining?  I was told I should set myself a
"trusted user", but I don't understand why I should be required to do
so.  I guess I could set `message-sendmail-f-is-evil' to t, but I'm
not sure if I want to do that.

So what's supposed to happen here?  Why does Gnus use `-f' by default,
and why doesn't my sendmail like it?