SMTPの挙動を理解するには・・・メールコマンドだと思う。
ドメイン登録なしのテストサーバで実施。
OS: CentOS Linux release 8.1.1911 (Core)
postfixインストール
# yum -y install postfix
Last metadata expiration check: 0:19:05 ago on Mon 09 Nov 2020 06:23:12 PM JST.
Dependencies resolved.
================================================================================
Package Architecture Version Repository Size
================================================================================
Installing:
postfix x86_64 2:3.3.1-12.el8 BaseOS 1.4 M
Installing dependencies:
libicu x86_64 60.3-2.el8_1 BaseOS 8.8 M
Transaction Summary
================================================================================
Install 2 Packages
Total download size: 10 M
Installed size: 36 M
Downloading Packages:
(1/2): postfix-3.3.1-12.el8.x86_64.rpm 8.4 MB/s | 1.4 MB 00:00
(2/2): libicu-60.3-2.el8_1.x86_64.rpm 21 MB/s | 8.8 MB 00:00
--------------------------------------------------------------------------------
Total 16 MB/s | 10 MB 00:00
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : libicu-60.3-2.el8_1.x86_64 1/2
Running scriptlet: libicu-60.3-2.el8_1.x86_64 1/2
Running scriptlet: postfix-2:3.3.1-12.el8.x86_64 2/2
Installing : postfix-2:3.3.1-12.el8.x86_64 2/2
Running scriptlet: postfix-2:3.3.1-12.el8.x86_64 2/2
Verifying : libicu-60.3-2.el8_1.x86_64 1/2
Verifying : postfix-2:3.3.1-12.el8.x86_64 2/2
Installed:
postfix-2:3.3.1-12.el8.x86_64 libicu-60.3-2.el8_1.x86_64
Complete!# postconf -n
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
command_directory = /usr/sbin
compatibility_level = 2
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5
html_directory = no
inet_interfaces = localhost
inet_protocols = all
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
meta_directory = /etc/postfix
mydestination = $myhostname, localhost.$mydomain, localhost
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix/README_FILES
sample_directory = /usr/share/doc/postfix/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
shlib_directory = /usr/lib64/postfix
smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
smtp_tls_CApath = /etc/pki/tls/certs
smtp_tls_security_level = may
smtpd_tls_cert_file = /etc/pki/tls/certs/postfix.pem
smtpd_tls_key_file = /etc/pki/tls/private/postfix.key
smtpd_tls_security_level = may
unknown_local_recipient_reject_code = 550# postfix check
## systemctl status postfix
● postfix.service - Postfix Mail Transport Agent
Loaded: loaded (/usr/lib/systemd/system/postfix.service; disabled; vendor pr>
Active: active (running) since Mon 2020-11-09 18:44:47 JST; 10s ago
Process: 31453 ExecStart=/usr/sbin/postfix start (code=exited, status=0/SUCCE>
Process: 31451 ExecStartPre=/usr/libexec/postfix/chroot-update (code=exited, >
Process: 31446 ExecStartPre=/usr/libexec/postfix/aliasesdb (code=exited, stat>
Main PID: 31520 (master)
Tasks: 3 (limit: 11506)
Memory: 6.3M
CGroup: /system.slice/postfix.service
tq31520 /usr/libexec/postfix/master -w
tq31521 pickup -l -t unix -u
mq31522 qmgr -l -t unix -u
Nov 09 18:44:46 XXX XXX-XXX-XX-XXX. systemd[1]: Starting Postfix Mail Transport Agen>
Nov 09 18:44:47 XXX XXX-XXX-XX-XXX. postfix/master[31520]: daemon started -- version>
Nov 09 18:44:47 XXX XXX-XXX-XX-XXX. systemd[1]: Started Postfix Mail Transport Agent.
lines 1-17/17 (END)送信テスト(^^)/
$ telnet localhost 25
Trying ::1...
Connected to localhost.
Escape character is '^]'.
XXX XXX-XXX-XX-XXX.localdomain ESMTP Postfix
EHLO localhost
XXX XXX-XXX-XX-XXX.localdomain
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250 SMTPUTF8
MAIL FROM: hoge@localhost
250 2.1.0 Ok
RCPT TO: hogehoge@localhost
250 2.1.5 Ok
DATA
354 End data with <CR><LF>.<CR><LF>
Subjet: testNo1
Hello world.
Take it easy.
Bye bye!
.
250 2.0.0 Ok: queued as 8EBAFE083E
quit
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