我使用 Cyberpanel 设置了一个电子邮件服务器（内部使用 dovecot + postfix）。我有一些票务软件连接到电子邮件服务器，用于批量发送电子邮件（目前试图一次向已购买票证的人发送大约 90 封电子邮件），但在日志中看到一半左右时，我收到了标题中的错误。我搜索了整个互联网，努力寻找遇到相同错误的人，而且肯定不是和我处于相同的情况。
Oct 18 14:06:10 localhost postfix/smtp[1615]: 5443BC09A2: to=<[email protected]>, relay=gmail-smtp-in.l.google.com[66.102.1.26]:25, delay=0.99, delays=0.1/0/0.16/0.73, dsn=2.0.0, status=sent (250 2.0.0 OK 1666101970 o5-20020a5d6485000000b0022adfca5d94si9257343wri.812 - gsmtp)
Oct 18 14:06:10 localhost postfix/qmgr[1170]: 5443BC09A2: removed
Oct 18 14:06:10 localhost postfix/smtp[1599]: D72D2C0946: to=<[email protected]>, relay=mx.cam.ac.uk[131.111.8.149]:25, delay=1.5, delays=0.09/0/0.08/1.3, dsn=2.0.0, status=sent (250 OK id=1oknEP-000Mm7-bb)
Oct 18 14:06:10 localhost postfix/qmgr[1170]: D72D2C0946: removed
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1444]: 5F32AC0946: client=unknown[138.68.169.127], sasl_method=PLAIN, [email protected]
Oct 18 14:06:10 localhost postfix/cleanup[1592]: 5F32AC0946: message-id=<[email protected]>
Oct 18 14:06:10 localhost postfix/qmgr[1170]: 5F32AC0946: from=<[email protected]>, size=2571, nrcpt=1 (queue active)
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1444]: disconnect from unknown[138.68.169.127] ehlo=1 auth=1 mail=1 rcpt=1 data=1 commands=5
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1433]: 9944EC0997: client=unknown[138.68.169.127], sasl_method=PLAIN, [email protected]
Oct 18 14:06:10 localhost postfix/cleanup[1633]: 9944EC0997: message-id=<[email protected]>
Oct 18 14:06:10 localhost postfix/qmgr[1170]: 9944EC0997: from=<[email protected]>, size=2565, nrcpt=1 (queue active)
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1433]: disconnect from unknown[138.68.169.127] ehlo=1 auth=1 mail=1 rcpt=1 data=1 commands=5
Oct 18 14:06:10 localhost postfix/smtp[1596]: EEC31C0B40: to=<[email protected]>, relay=mx.cam.ac.uk[131.111.8.147]:25, delay=0.83, delays=0.06/0/0.1/0.67, dsn=2.0.0, status=sent (250 OK id=1oknEQ-000kXq-Wl)
Oct 18 14:06:10 localhost postfix/qmgr[1170]: EEC31C0B40: removed
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1448]: warning: unknown[138.68.169.127]: SASL PLAIN authentication failed: Connection lost to authentication server
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1440]: warning: unknown[138.68.169.127]: SASL PLAIN authentication failed: Connection lost to authentication server
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1448]: lost connection after AUTH from unknown[138.68.169.127]
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1448]: disconnect from unknown[138.68.169.127] ehlo=1 auth=0/1 commands=1/2
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1440]: lost connection after AUTH from unknown[138.68.169.127]
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1440]: disconnect from unknown[138.68.169.127] ehlo=1 auth=0/1 commands=1/2
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1456]: warning: unknown[138.68.169.127]: SASL PLAIN authentication failed: Connection lost to authentication server
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1456]: lost connection after AUTH from unknown[138.68.169.127]
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1456]: disconnect from unknown[138.68.169.127] ehlo=1 auth=0/1 commands=1/2
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1468]: warning: unknown[138.68.169.127]: SASL PLAIN authentication failed: Connection lost to authentication server
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1468]: lost connection after AUTH from unknown[138.68.169.127]
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1468]: disconnect from unknown[138.68.169.127] ehlo=1 auth=0/1 commands=1/2
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1471]: warning: unknown[138.68.169.127]: SASL PLAIN authentication failed: Connection lost to authentication server
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1471]: lost connection after AUTH from unknown[138.68.169.127]
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1471]: disconnect from unknown[138.68.169.127] ehlo=1 auth=0/1 commands=1/2
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1489]: warning: unknown[138.68.169.127]: SASL PLAIN authentication failed: Connection lost to authentication server
Oct 18 14:06:10 localhost postfix/smtps/smtpd[1489]: lost connection after AUTH from unknown[138.68.169.127]
日志的前半部分工作正常，后半部分则不正常。我猜是身份验证服务器不堪重负。我已经尝试将工作线程数增加到很高的值。