내 서버에서 배달 상태 알림(지연) 이메일을 받나요?

나는 Debian Jessie 서버를 사용하고 있으며설정 4번출구postfix나 sendmail 대신 이메일을 보내주세요.

그때부터 다음과 같은 이메일을 많이 받기 시작했습니다.

첫 번째:

제목:*vultr.guest에 대한 보안 정보*

텍스트: vultr.guest: 12월 7일 12:13:29: 루트: vultr.guest 호스트를 확인할 수 없습니다.

두번째:

제목: Cron test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp

몸:

This is an automatically generated Delivery Status Notification

THIS IS A WARNING MESSAGE ONLY.

YOU DO NOT NEED TO RESEND YOUR MESSAGE.

Delivery to the following recipient has been delayed:

     [email protected]

Message will be retried for 2 more day(s)

Technical details of temporary failure:
The recipient server did not accept our requests to connect. Learn more at https://support.google.com/mail/answer/7720
[(10) example.com. [xxx.xxx.xxx.90]:25: socket error]

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

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=from:to:subject:mime-version:content-type:content-transfer-encoding
         :message-id:date;
        bh=k/8GlT8DBvBIJzBOOfw8qR0kGPzj7m9ZR/aj+JOKBhg=;
        b=eA6kpVtS0eNBO0CFBfLzlnaYwZ9/GubMaWTGUkG4MaxbNy55YxY2jZAuh3RHI2mo8Q
         qp5OmKihchYTgCxcAx0xvJaXuuxDhoT9dCJ6YEIzqjmypWjpUEqoXkNu7uKU4Cd1vTfS
         5/dSvE7zVE6TYe4L18vrOiYBEUNrJQ3lTdv//RrlHZs/f62GorIyMHgVL4XvkVNLWF/K
         lK9SSybf9ee3KTKUxurBm1Tyah62Gk4/869Hynr1QEAjSAzM8sSKDyKH/KOZ06sDWtPQ
         jE0Agxffk8RkhsFkEtIbpZBfS/zagGZ8+CXsGqR9541ylMAHGOGeYtRp4oiB8tVP2Sbv
         h4Rw==
X-Received: by 10.129.114.10 with SMTP id n10mr3081975ywc.0.1449600002717;
        Tue, 08 Dec 2015 10:40:02 -0800 (PST)
Return-Path: <[email protected]>
Received: from vultr.guest ([104.156.246.90])
        by smtp.gmail.com with ESMTPSA id f203sm2998216ywf.45.2015.12.08.10.40.02
        for <[email protected]>
        (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
        Tue, 08 Dec 2015 10:40:02 -0800 (PST)
From: Cron Daemon <[email protected]>
X-Google-Original-From: [email protected] (Cron Daemon)
Received: from smmsp by vultr.guest with local (Exim 4.84)
        (envelope-from <[email protected]>)
        id 1a6NBB-0007Vu-Os
        for [email protected]; Tue, 08 Dec 2015 13:40:01 -0500
To: [email protected]
Subject: Cron <smmsp@vultr> test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-Cron-Env: <MAILTO=root>
X-Cron-Env: <SHELL=/bin/sh>
X-Cron-Env: <HOME=/var/lib/sendmail>
X-Cron-Env: <PATH=/usr/bin:/bin>
X-Cron-Env: <LOGNAME=smmsp>
Message-Id: <[email protected]>
Date: Tue, 08 Dec 2015 13:40:01 -0500

편집하고 먼저 /etc/cron.d/sendmail해당 행을 내 Gmail 주소로 변경해 보았습니다. 그러나 이것은 도움이 되지 않습니다. 그래서 나는 그 줄에 주석을 달고MAILTO=root

*/20 *    *    *    *       smmsp   test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp

이렇게 하면 20분마다 스팸 메일을 보내지 않게 됩니다. 하지만 난 아직도 항상 많은 이메일을 받고 있어요

주제:*vultr.guest에 대한 보안 정보* 몸:

This is an automatically generated Delivery Status Notification

THIS IS A WARNING MESSAGE ONLY.

YOU DO NOT NEED TO RESEND YOUR MESSAGE.

Delivery to the following recipient has been delayed:

     [email protected]

Message will be retried for 1 more day(s)

Technical details of temporary failure:
The recipient server did not accept our requests to connect. Learn more at https://support.google.com/mail/answer/7720
[(10) example.com. [xxx.xxx.xxx.90]:25: socket error]

나는 그것을 수정 /etc/hostname하고 삭제 vultr.guest하고 사용했습니다 example.com. 내가 /etc/hosts가진 것은 다음과 같습니다.

127.0.0.1   localhost
127.0.1.1   install.install install

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

내가 무엇을 잘못 구성했나요? 어떻게 해결할 수 있나요?

업데이트: /etc/exim4/update-exim4.conf.conf내용은 다음과 같습니다.

dc_eximconfig_configtype='satellite'
dc_other_hostnames=''
dc_local_interfaces='127.0.0.1 ; ::1'
dc_readhost=''
dc_relay_domains=''
dc_minimaldns='false'
dc_relay_nets=''
dc_smarthost='smtp.gmail.com::587'
CFILEMODE='644'
dc_use_split_config='false'
dc_hide_mailname='true'
dc_mailname_in_oh='true'
dc_localdelivery='mail_spool'