I just received an email through another email list. This email was
obviously from a real list member based on the headers and content.
The strange thing is that the From address shows as the local user who
owns the virtual maildirs on my server.
I also noticed that SpamAssassin marked this message with a rule
stating that there were no lowercase letters in the From address. But
when I look at it, there are only lowercase letters. It seems like
Courier rewrote the From address for some reason -- possibly when
Maildrop resubmitted the message for delivery to our internal
mailserver. Would this happen for an empty From address? Any other
reason?
I have this set in my maildroprc for mail delivery (along with a
patched deliver.C to enable the -f option):
import SENDER
SENDMAIL="/usr/lib/courier/bin/sendmail -f \"$SENDER\""
Is there any case where SENDER would default to the local user for an
external email?
This is the only time I have seen this happen, but it is really
strange.
--
Bowie
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