2025-12-07 20:42:17 SERVER -&gt; CLIENT: 220 mail67.conoha.ne.jp ESMTP Postfix<br>
2025-12-07 20:42:17 CLIENT -&gt; SERVER: EHLO doutou-kanko.web-demo.work<br>
2025-12-07 20:42:17 SERVER -&gt; CLIENT: 250-mail67.conoha.ne.jp250-PIPELINING250-SIZE 140000000250-ETRN250-STARTTLS250-AUTH PLAIN LOGIN250-ENHANCEDSTATUSCODES250-8BITMIME250 DSN<br>
2025-12-07 20:42:17 CLIENT -&gt; SERVER: STARTTLS<br>
2025-12-07 20:42:17 SERVER -&gt; CLIENT: 220 2.0.0 Ready to start TLS<br>
2025-12-07 20:42:18 CLIENT -&gt; SERVER: EHLO doutou-kanko.web-demo.work<br>
2025-12-07 20:42:18 SERVER -&gt; CLIENT: 250-mail67.conoha.ne.jp250-PIPELINING250-SIZE 140000000250-ETRN250-AUTH PLAIN LOGIN250-ENHANCEDSTATUSCODES250-8BITMIME250 DSN<br>
2025-12-07 20:42:18 CLIENT -&gt; SERVER: AUTH LOGIN<br>
2025-12-07 20:42:18 SERVER -&gt; CLIENT: 334 VXNlcm5hbWU6<br>
2025-12-07 20:42:18 CLIENT -&gt; SERVER: [credentials hidden]<br>
2025-12-07 20:42:18 SERVER -&gt; CLIENT: 334 UGFzc3dvcmQ6<br>
2025-12-07 20:42:18 CLIENT -&gt; SERVER: [credentials hidden]<br>
2025-12-07 20:42:20 SERVER -&gt; CLIENT: 535 5.7.8 Error: authentication failed: UGFzc3dvcmQ6<br>
2025-12-07 20:42:20 SMTP ERROR: Password command failed: 535 5.7.8 Error: authentication failed: UGFzc3dvcmQ6<br>
SMTP Error: Could not authenticate.<br>
2025-12-07 20:42:20 CLIENT -&gt; SERVER: QUIT<br>
2025-12-07 20:42:20 SERVER -&gt; CLIENT: 221 2.0.0 Bye<br>
SMTP Error: Could not authenticate.<br>
メール送信エラー: SMTP Error: Could not authenticate.
詳細: SMTP Error: Could not authenticate.