Предупреждающие сообщения постфикса: заменить предыдущую запись

Я настроил postfix со спутниковой конфигурацией. В своем системном журнале я обнаружил следующие предупреждения. Есть идеи, что это значит? Как я могу решить эту проблему?

Jul 16 13:39:24 mou-lanister postmulti[2042]: warning: /etc/postfix/main.cf, line 43: overriding earlier entry: relayhost=smtp.gmail.com
Jul 16 13:39:24 mou-lanister postmulti[2046]: warning: /etc/postfix/main.cf, line 43: overriding earlier entry: relayhost=smtp.gmail.com
Jul 16 13:39:24 mou-lanister postmulti[2053]: warning: /etc/postfix/main.cf, line 43: overriding earlier entry: relayhost=smtp.gmail.com
Jul 16 13:39:24 mou-lanister postmulti[2057]: warning: /etc/postfix/main.cf, line 43: overriding earlier entry: relayhost=smtp.gmail.com
Jul 16 13:39:24 mou-lanister postmulti[2061]: warning: /etc/postfix/main.cf, line 43: overriding earlier entry: relayhost=smtp.gmail.com
Jul 16 13:39:24 mou-lanister postmulti[2063]: warning: /etc/postfix/main.cf, line 43: overriding earlier entry: relayhost=smtp.gmail.com
Jul 16 13:39:24 mou-lanister postmulti[2065]: warning: /etc/postfix/main.cf, line 43: overriding earlier entry: relayhost=smtp.gmail.com
Jul 16 13:39:24 mou-lanister postmulti[2069]: warning: /etc/postfix/main.cf, line 43: overriding earlier entry: relayhost=smtp.gmail.com
Jul 16 13:39:25 mou-lanister postmulti[2095]: warning: /etc/postfix/main.cf, line 43: overriding earlier entry: relayhost=smtp.gmail.com
Jul 16 13:39:25 mou-lanister postfix[2096]: warning: /etc/postfix/main.cf, line 43: overriding earlier entry: relayhost=smtp.gmail.com
Jul 16 13:39:26 mou-lanister postfix/master[2101]: warning: /etc/postfix/main.cf, line 43: overriding earlier entry: relayhost=smtp.gmail.com
Jul 16 13:39:27 mou-lanister postfix/master[2131]: warning: /etc/postfix/main.cf, line 43: overriding earlier entry: relayhost=smtp.gmail.com
Jul 16 13:39:27 mou-lanister postfix/master[2131]: daemon started -- version 2.11.0, configuration /etc/postfix
Jul 16 13:39:27 mou-lanister postfix/qmgr[2137]: warning: /etc/postfix/main.cf, line 43: overriding earlier entry: relayhost=smtp.gmail.com
Jul 16 13:39:27 mou-lanister postfix/pickup[2136]: warning: /etc/postfix/main.cf, line 43: overriding earlier entry: relayhost=smtp.gmail.com

И что означает следующее электронное письмо? Это какая-то ошибка конфигурации?

Mail Delivery Subsystem

Jul 15 (1 day ago)

to me
Delivery to the following recipient failed permanently:

     root@lanister.net

Technical details of permanent failure:
The recipient server did not accept our requests to connect. Learn more at http://support.google.com/mail/bin/answer.py?answer=7720
[(0) lanister.net. [2a00:15f8:a000:5:1:12:5:e733]:25: Connection refused]
[(0) lanister.net. [2a00:15f8:a000:5:1:14:5:e733]:25: Connection refused]
[(0) lanister.net. [2a00:15f8:a000:5:1:11:5:e733]:25: Connection refused]
[(0) lanister.net. [2a00:15f8:a000:5:1:13:5:e733]:25: Connection refused]
[(0) lanister.net. [90.156.201.116]:25: Connection refused]
[(0) lanister.net. [90.156.201.80]:25: Connection refused]
[(0) lanister.net. [90.156.201.52]:25: Connection refused]
[(0) lanister.net. [90.156.201.94]:25: Connection refused]

----- Original message -----

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
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         eqdiUWJCfoBUARXlQi7NdhxBp2r9JnLbzZ2+E15Fwh57Ldpw6uwW1DqKt8Z/rrCDGuq6
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         0o/ng1dDWUAiPURxknLyAg/wu1oSY7mXA6hdbN2EuwqF5I0K4ww6JCGw/5it/HNzRWPI
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         jfWA==
X-Received: by 10.50.77.48 with SMTP id p16mr11423986igw.41.1405165154249;
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Return-Path: <myusername@gmail.com>
Received: from mou-lanister (mydomainname.net [my-external-IP])
        by mx.google.com with ESMTPSA id vk3sm4844593igb.17.2014.07.12.04.39.11
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        (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
        Sat, 12 Jul 2014 04:39:12 -0700 (PDT)
From: myusernamename@gmail.com
X-Google-Original-From: mou@lanister.net
Received: by mou-lanister (Postfix, from userid 1000)
        id B505C1480086; Sat, 12 Jul 2014 07:39:08 -0400 (EDT)
To: root@lanister.net
Auto-Submitted: auto-generated
Subject: *** SECURITY information for mou-lanister ***
Message-Id: <20140712113908.B505C1480086@mou-lanister>
Date: Sat, 12 Jul 2014 07:39:08 -0400 (EDT)

mou-lanister : Jul 12 07:39:08 : mou : 1 incorrect password attempt ; TTY=pts/5 ; PWD=/home/mou ; USER=root ; COMMAND=/usr/bin/apt-get install ircii