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3.
MX レコードを引いて
SMTP を叩いてみる
$ nslookup -type=mx gmail.com
Server: 172.16.0.23
Address: 172.16.0.23#53
Non-authoritative answer:
gmail.com mail exchanger = 20 alt2.gmail-smtp-in.l.google.com.
gmail.com mail exchanger = 30 alt3.gmail-smtp-in.l.google.com.
gmail.com mail exchanger = 40 alt4.gmail-smtp-in.l.google.com.
gmail.com mail exchanger = 5 gmail-smtp-in.l.google.com.
gmail.com mail exchanger = 10 alt1.gmail-smtp-in.l.google.com.
Authoritative answers can be found from:
alt3.gmail-smtp-in.l.google.com internet address = 74.125.113.27
4.
MX レコードを引いて
SMTP を叩いてみる
$ rlwrap telnet alt3.gmail-smtp-in.l.google.com 25
Trying 74.125.113.27...
Connected to alt3.gmail-smtp-in.l.google.com.
Escape character is '^]'.
220 mx.google.com ESMTP cy3si7427630vdc.109
HELO
250 mx.google.com at your service
MAIL FROM: <amachang@amachang.com>
250 2.1.0 OK cy3si7427630vdc.109
RCPT TO: <seijro@gmail.com>
250 2.1.5 OK cy3si7427630vdc.109
DATA
354 Go ahead cy3si7427630vdc.109
Subject: hoge
From: hoge
To: hoge
hoge
.
250 2.0.0 OK 1318668890 cy3si7427630vdc.109
QUIT
221 2.0.0 closing connection cy3si7427630vdc.109
Connection closed by foreign host.
5.
メールのヘッダを見てみる
Delivered-To: seijro@gmail.com
Received: by 10.220.181.4 with SMTP id bw4cs30846vcb;
Sat, 15 Oct 2011 01:51:12 -0700 (PDT)
Received: by 10.52.176.98 with SMTP id ch2mr12032698vdc.82.1318668671402;
Sat, 15 Oct 2011 01:51:11 -0700 (PDT)
Return-Path: <amachang@amachang.com>
Received: from (ec2-175-41-197-166.ap-northeast-1.compute.amazonaws.com. [175.41.197.1
by mx.google.com with SMTP id g9si7453472vdv.27.2011.10.15.01.50.23;
Sat, 15 Oct 2011 01:51:11 -0700 (PDT)
Received-SPF: neutral (google.com: 175.41.197.166 is neither permitted nor denied by best gu
Authentication-Results: mx.google.com; spf=neutral (google.com: 175.41.197.166 is neither pe
Date: Sat, 15 Oct 2011 01:51:11 -0700 (PDT)
Message-Id: <4e99497f.e948340a.6648.3bc5SMTPIN_ADDED@mx.google.com>
Subject: hoge
To: hoge
From: hoge
hoge