AWSのSimple Email Service(SES)ではUse Transport Layer Security (TLS)を使わないいけないので、簡単にtelnetから接続できません。
下記はサーバーから送信できるかどうかを試してみる手順です。
SMTP credentialsトークンの生成
$ perl -MMIME::Base64 -e 'print encode_base64("auth-user-name");'
QUtJ...auth-user....RMSUE=
$ perl -MMIME::Base64 -e 'print encode_base64("auth-password");'
QXVDR...auth-pass....3Q=
メール送信
$ openssl s_client -crlf -quiet -starttls smtp -connect email-smtp.us-west-2.amazonaws.com:587
depth=2 C = US, O = "VeriSign, Inc.", OU = VeriSign Trust Network, OU = "(c) 2006 VeriSign, Inc. - For authorized use only", CN = VeriSign Class 3 Public Primary Certification Authority - G5
verify return:1
depth=1 C = US, O = Symantec Corporation, OU = Symantec Trust Network, CN = Symantec Class 3 Secure Server CA - G4
verify return:1
depth=0 C = US, ST = Washington, L = Seattle, O = "Amazon.com, Inc.", CN = email-smtp.us-west-2.amazonaws.com
verify return:1
250 Ok
EHLO smtp.example.com # ← 入力
250-email-smtp.amazonaws.com
250-8BITMIME
250-SIZE 10485760
250-STARTTLS
250-AUTH PLAIN LOGIN
250 Ok
AUTH LOGIN # ← 入力
334 VXNlcm5hbWU6
QUtJ...auth-user....RMSUE= # ← 入力
334 UGFzc3dvcmQ6
QXVDR...auth-pass....3Q= # ← 入力
235 Authentication successful.
MAIL FROM: info@example.com # ← 入力
250 Ok
rcpt TO: test@example.com # ← 入力
250 Ok
DATA # ← 入力
354 End data with <CR><LF>.<CR><LF>
From: info@example.com # ← 入力
Subject: SES TEST # ← 入力
Hello World # ← 入力
. # ← 入力
250 Ok 0101015af9158693-aec4e9fe-5e1f-4211-826a-f9ca21411aac-000000
421 Timeout waiting for data from client. # 入力せずにtimeout
メール確認
Delivered-To: test@example.com
Received: by .........;
Wed, 22 Mar 2017 19:53:43 -0700 (PDT)
X-Received: by .......
....
From: info@example.com
Subject: SES TEST
Message-ID: <0101015af9158693-aec4e9fe-5e1f-4211-826a-f9ca21411aac-000000@us-west-2.amazonses.com>
Date: Thu, 23 Mar 2017 02:53:42 +0000
X-SES-Outgoing: 2017.03.23-54.240.27.29
Feedback-ID: 1.us-west-2.jj20/+c1csFRX4yd6JTZjvVI/J8oJxtSw+150dH6qcs=:AmazonSES
Hello World