### Sendmail 시작하기 ###
### AWS EC2 에서 Sendmail 을 사용하기 위한 설정
1. aws support case 를 통해서 ec2 에 대한 25 port 사용허가를 요청한후 허가를 받는다.
https://aws.amazon.com/premiumsupport/knowledge-center/ec2-port-25-throttle/
https://aws-portal.amazon.com/gp/aws/html-forms-controller/contactus/ec2-email-limit-rdns-request
위의 요청은 root account 를 통해서만 가능하다.
2. yum install -y sendmail sendmail-cf 명령을 통해 sendmail 을 설치한다.
2017년 8월 28일 까지의 최신 버전에는 sendmail 를 기본 설치 및 서비스가 올라와 있으며, sendmail-cf 만 추가 설치 진행하면 된다.
- RHEL, Amazon Linux
yum install -y sendmail sendmail-cf
- Ubuntu
apt-get install sendmail
- Suse
zypper install sendmail
3. iptable 허용 여부 및 selinux 여부를 확인
iptable 은 기본정책이 되어 있는것은 없으며, selinux 도 disable 로 되어 있습니다.
iptables -L -> 정책 확인 명령어
iptables -F -> 전체 정책 삭제 명령어
getenforce -> selinux 상태 확인 명령어
setenforce 0 -> selinux 가 Enforcing 일때
Amazon Linux, Redhat Linux 는 Selinux 설치되어 있으며, 초기는 Disabled 상태 / Ubuntu Linux, Suse Linux 는 Selinux 설치 안되어 있습니다.
Amazon, Redhat, Ubuntu, Suse 전부 iptables 정책은 걸려 있지 않습니다.
4. 서비스할 도메인의 등록 (local-host-names)
local-host-names 을 편집합니다.
vim /etc/mail/local-host-names
# local-host-names - include all aliases for your machine here.
smtp01.test.com
smtp02.test.com
5. 메일서버를 외부에서 사용할수 있도록 sendmail.mc 파일 수정
vi /etc/mail/sendmail.mc
dnl ### allow mail DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
DAEMON_OPTIONS(`Port=smtp,Addr=0.0.0.0, Name=MTA')dnl
# 디비 등록
m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
6. sendmail.cf 도메인 등록
vi /etc/mail/sendmail.cf
# my official domain name
# ... define this only if sendmail cannot automatically determine your domain
Djtest.com
7. 테스트를 위한 mail 명령어 설치
- RHEL, Amazon Linux
yum install -y mailx
- Ubuntu
apt install mailutils
- Suse
zypper install mailx
8. local mail 발송 테스트
ip-xxx-xxx-xxx-xxx:~ # mail localhost root
Subject: test
123
456
7678
.
EOT
9. 메일 수신 확인
From ec2-user@ip-10-90-10-249 Thu Sep 7 01:23:14 2017
Return-Path: <ec2-user@ip-10-90-10-249>
Received: from ip-10-90-10-249 (localhost [127.0.0.1])
by ip-10-90-10-249 (8.14.9/8.14.9/SuSE Linux 0.8) with ESMTP id v871NE4w001567;
Thu, 7 Sep 2017 01:23:14 GMT
Received: (from root@localhost)
by ip-10-90-10-249 (8.14.9/8.14.9/Submit) id v871NE5f001566;
Thu, 7 Sep 2017 01:23:14 GMT
From: cloud-init created default user <ec2-user@ip-10-90-10-249>
Message-Id: <201709070123.v871NE5f001566@ip-10-90-10-249>
Date: Thu, 07 Sep 2017 01:23:13 +0000
To: root@ip-10-90-10-249, localhost@ip-10-90-10-249
Subject: test
User-Agent: Heirloom mailx 12.5 7/5/10
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
123
456
7678
- Amazon Linux Sendmail version
[root@ip-10-90-10-49 ~]# rpm -qa | grep sendmail
sendmail-8.14.4-9.14.amzn1.x86_64
sendmail-cf-8.14.4-9.14.amzn1.x86_64
- Redhat Linux Sendmail version
[root@ip-10-90-10-54 ~]# rpm -qa | grep sendmail
sendmail-cf-8.14.7-5.el7.noarch
sendmail-8.14.7-5.el7.x86_64
- Suse Linux Sendmail version
ip-10-90-10-249:/etc/mail # rpm -qa | grep sendmail
sendmail-8.14.9-2.80.x86_64
- Ubuntu Linux Sendmail version
ubuntu@ip-10-90-10-130:~$ dpkg -l | grep sendmail
ii sendmail 8.15.2-3 all powerful, efficient, and scalable Mail Transport Agent (metapackage)
ii sendmail-base 8.15.2-3 all powerful, efficient, and scalable Mail Transport Agent (arch independent files)
ii sendmail-bin 8.15.2-3 amd64 powerful, efficient, and scalable Mail Transport Agent
ii sendmail-cf 8.15.2-3 all powerful, efficient, and scalable Mail Transport Agent (config macros)
ubuntu@ip-10-90-10-130:~$
### Sendmail 정리 ### [amazon linux]
### SES 문서에 언급되어 있는 Sendmail 관련 내용
http://docs.aws.amazon.com/ko_kr/ses/latest/DeveloperGuide/sendmail.html
### Sendmail 을 사용하기 위해서 "yum install sendmail" 을 통해 Sendmail 을 설치
[root@ip-10-90-10-49 ~]# yum install sendmail
Loaded plugins: priorities, update-motd, upgrade-helper
amzn-main | 2.1 kB 00:00:00
amzn-updates | 2.3 kB 00:00:00
Package sendmail-8.14.4-9.14.amzn1.x86_64 already installed and latest version
Nothing to do
[root@ip-10-90-10-49 ~]#
### Sendmail 설정을 위한 Package 설치 "yum install sendmail-cf"
[root@ip-10-90-10-49 ~]# yum install sendmail-cf
Loaded plugins: priorities, update-motd, upgrade-helper
Resolving Dependencies
--> Running transaction check
---> Package sendmail-cf.x86_64 0:8.14.4-9.14.amzn1 will be installed
--> Processing Dependency: m4 for package: sendmail-cf-8.14.4-9.14.amzn1.x86_64
--> Running transaction check
---> Package m4.x86_64 0:1.4.16-9.10.amzn1 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
=====================================================================================================================
Package Arch Version Repository Size
=====================================================================================================================
Installing:
sendmail-cf x86_64 8.14.4-9.14.amzn1 amzn-main 316 k
Installing for dependencies:
m4 x86_64 1.4.16-9.10.amzn1 amzn-main 263 k
Transaction Summary
=====================================================================================================================
Install 1 Package (+1 Dependent package)
Total download size: 579 k
Installed size: 1.4 M
Is this ok [y/d/N]: y
Downloading packages:
(1/2): m4-1.4.16-9.10.amzn1.x86_64.rpm | 263 kB 00:00:00
(2/2): sendmail-cf-8.14.4-9.14.amzn1.x86_64.rpm | 316 kB 00:00:00
---------------------------------------------------------------------------------------------------------------------
Total 733 kB/s | 579 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : m4-1.4.16-9.10.amzn1.x86_64 1/2
Installing : sendmail-cf-8.14.4-9.14.amzn1.x86_64 2/2
Verifying : sendmail-cf-8.14.4-9.14.amzn1.x86_64 1/2
Verifying : m4-1.4.16-9.10.amzn1.x86_64 2/2
Installed:
sendmail-cf.x86_64 0:8.14.4-9.14.amzn1
Dependency Installed:
m4.x86_64 0:1.4.16-9.10.amzn1
Complete!
[root@ip-10-90-10-49 ~]#
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