How work postfix, exim4 and courier together?
I would like to understand what this demons are doing. In the mail logfiles I found a notice:
error: mailbox_size_limit is smaller than message_size_limit
I now that I can edit the mailbox_size_limit
in postfix but not the message_size_limit
. It must came from exim4. What is exim4 doing and why postfix doesn't do the exim4 tasks? What have the courier demon to do?