If one sends an e-mail to an invalid address (i.e. firstname.lastname@example.org)
then the rejection notice (i.e. User Unknown) is often returned to
sendmail with the 'return-path' blank.
Normally sendmail delivers this notice to the originator of the original e-
If linuxconf is used to generate the sendmail.cf, then about 80% of the
time the notification is discarded with a error message placed in the
maillog file. (I assume that for the other 20% the return-path is
provided. I know that the problem happens for all mail bounced from AOL,
but from lots of other places as well.)
I suspect the check_mail rule is the culprit, but I am not sure.
Work-around: Use /etc/sendmail.mc file and the m4 macros to generate your
Closing because we don't ship linuxconf anymore
Changed to 'CLOSED' state since 'RESOLVED' has been deprecated.