Hi!
is it possible to reject mails which have from=<> in the logfile?
No. And if you do, you'll quickly get blacklisted for running a broken mail server.
like this
Aug 20 09:50:47 whitestar courierd: started,id=0000B806.3F432852.0000787B,from=<>,module=local,host=mail-thomas!!5062!5060!/home/mail/thomas!!,addr=<mail-thomas>
as we got up to 2000 spam mails in the last 10h .. all filtert with spamassassin but why deliver anyway? who as a from=<> normal?
It is perfectly normal. Empty envelope return addresses are used for delivery status notifications.
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