[exim] localhost vs 127.0.0.1

Hi all,

I had a big problem I did not figured out.
It is solved, but I have questions about the matter.

It's about Exim 4.72/CentOS 6.


Connecting to Exim via "localhost" is denies relay
Connecting to Exim via 127.0.0.1 accepts the relay
"localhost" is in the local_domains domainlists
"localhost" is resolving to 127.0.0.1 in /etc/hosts


Why?



[mihamina@recette53 ~]$ rpm -aq | grep exim
exim-4.72-4.el6.x86_64

[mihamina@recette53 ~]$ telnet localhost 25
Trying ::1...
Connected to localhost.
Escape character is '^]'.
220 recette53.ideoneov.com ESMTP Exim 4.72 Mon, 11 Mar 2013 10:09:27 +0100
HELO mihamina
250 recette53.ideoneov.com Hello localhost [::1]
MAIL from: <mrakotom@???>
250 OK
RCPT to: <mihamina@???>
550 relay not permitted


mihamina@recette53 ~]$ telnet 127.0.0.1 25
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
220 recette53.ideoneov.com ESMTP Exim 4.72 Mon, 11 Mar 2013 10:10:26 +0100
HELO mihamina
250 recette53.ideoneov.com Hello localhost [127.0.0.1]
MAIL from: <mrakotom@???>
250 OK
RCPT to: <mihamina@???>
250 Accepted
DATA
354 Enter message, ending with "." on a line by itself
From: <mrakotom@???>
To: <mihamina@???>
Subject: Haftra Andrana

Ity dia andrana fotsiny ihany.
.
250 OK id=1UEykk-0006Fr-TO
QUIT
221 recette53.ideoneov.com closing connection




--
RMA.