How work postfix, exim4 and courier together?

[tom]

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?

tom

[falko]

Both Postfix and Exim are mailservers. If you have Postfix installed, then Exim is not installed, and if Exim is installed, then Postfix isn't.
Courier is the POP3/IMAP server (that you use to fetch mails from the server).
I have answered to your message_size_limit problem in your other thread. :)

[tom]

Both Postfix and Exim are mailservers. If you have Postfix installed, then Exim is not installed, and if Exim is installed, then Postfix isn't.
Courier is the POP3/IMAP server (that you use to fetch mails from the server).
I have answered to your in your other thread. :)

Thanks for resolving the message_size_limit problem :-)

When I was searching for message_size_limit if found that line:
/etc/exim4/conf.d/main/02_exim4-config_options:message_size_limit = MESSAGE_SIZE_LIMIT

That seem to me that exim and postfix are installed. Is'nt it?

tom

[till]

That seem to me that exim and postfix are installed. Is'nt it?

It might be, but i dont think so. I guess there are only the config files from a prevoius exim installation left.

if you run:

ntstat -tap

Is exim or postfix listed as smtp daemon?