SMTPサーバー（Postfix）を設定し、自分のGmailにメールを送信し、Gmailから次のメールを受け取ります。
This is the mail system at host mail.pahlevanzadeh.net.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<[email protected]>: host gmail-smtp-in.l.google.com[142.250.31.27]
said: 550-5.7.26 This message does not have authentication information or
fails to 550-5.7.26 pass authentication checks. To best protect our users
from spam, the 550-5.7.26 message has been blocked. Please visit 550-5.7.26
https://support.google.com/mail/answer/81126#authentication for more 550
5.7.26 information. m13si7030284qvk.215 - gsmtp (in reply to end of DATA
command)
Reporting-MTA: dns; mail.pahlevanzadeh.net
X-Postfix-Queue-ID: 96B203C01C0
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Sat, 6 Jun 2020 11:37:33 -0400 (AST)
Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.7.26
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.26 This message does not have authentication
information or fails to 550-5.7.26 pass authentication checks. To best
protect our users from spam, the 550-5.7.26 message has been blocked.
Please visit 550-5.7.26
https://support.google.com/mail/answer/81126#authentication for more 550
5.7.26 information. m13si7030284qvk.215 - gsmtp
salamkdsdjfi.eml
Subject:
salamkdsdjfi
From:
Mohsen Pahlevanzadeh <[email protected]>
Date:
6/6/20, 8:06 PM
To:
Pahlevanzadeh <[email protected]>
dwjkdjkdjvkdlvnfklvnfklvf
私の問題は何ですか？
答え1
エラーは次のとおりです。
所有者gmail-smtp-in.l.google.com[142.250.31.27]説明する：550-5.7.26 メッセージに認証情報がないか失敗しました。 550-5.7.26認証確認パス。
(強調は私のもの)
これ以上追加するものはありません。最初に SMTP セッションを認証しないと、Google はユーザーからサーバーにメッセージを送信することを許可しません。