if my memory serves me well sendmail sends out a warning mail if it
cannot deliver a mail "in time". It keeps on retrying and will bounce
the mail if the retry time has been reached.
Now in exim I found the retry section and I am quite happy with it, BUT
I cannot find a "warning mail" facility. Personally I think senders
should be informed if a mail is could not be delivered within a suitable
time (e.g. 30 minutes). Can I do this with exim?
