Log4j2 SMTP-Appender «Сначала необходимо выполнить команду STARTTLS»

Я пытаюсь отправить записи журнала с серьезностью «ошибка» по электронной почте в java. В моем файле log4j2.xml у меня есть следующий SMTP-приложение:

<SMTP>
name = "Mail"
subject = "Error Log"
to = "[email protected]"
from = "[email protected]"
smtpHost = "SMTP-Host"
smtpPort = "587"
smtpPassword = "[password]" 
smtpUsername = "[email protected]"
smtpDebug = "true"
ignoreExceptions = "false"
bufferSize = "4"
smtpProtocol = "smtp">
</SMTP>

Но когда я запускаю свою программу (которая состоит из основной записи строки), возникает следующая ошибка:

DEBUG: setDebug: JavaMail version 1.4.7
13:13:44.469 [main] ERROR Main - Test Error
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "SMTP-Host", port 587, isSSL false
220 SMTP-Host ESMTP Postfix (Debian/GNU)
DEBUG SMTP: connected to host "SMTP-Host", port: 587

EHLO MAXPC
250-SMTP-Host
250-PIPELINING
250-SIZE 52428800
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
DEBUG SMTP: Found extension "PIPELINING", arg ""
DEBUG SMTP: Found extension "SIZE", arg "52428800"
DEBUG SMTP: Found extension "ETRN", arg ""
DEBUG SMTP: Found extension "STARTTLS", arg ""
DEBUG SMTP: Found extension "ENHANCEDSTATUSCODES", arg ""
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "DSN", arg ""
DEBUG SMTP: use8bit false
MAIL FROM:<[email protected]>
530 5.7.0 Must issue a STARTTLS command first
DEBUG SMTP: got response code 530, with response: 530 5.7.0 Must issue a STARTTLS command first

RSET
530 5.7.0 Must issue a STARTTLS command first
DEBUG SMTP: MessagingException while sending, THROW: 
com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first

    at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2108)
    at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1609)
    at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1117)
    at javax.mail.Transport.send0(Transport.java:195)
    at javax.mail.Transport.send(Transport.java:124)
    at org.apache.logging.log4j.core.net.SmtpManager.sendMultipartMessage(SmtpManager.java:257)
    at org.apache.logging.log4j.core.net.SmtpManager.sendEvents(SmtpManager.java:172)
    at org.apache.logging.log4j.core.appender.SmtpAppender.append(SmtpAppender.java:181)
    at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
    at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:464)
    at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:448)
    at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:431)
    at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:406)
    at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63)
    at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:146)
    at org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2170)
    at org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2125)
    at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2108)
    at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2007)
    at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1866)
    at org.apache.logging.slf4j.Log4jLogger.error(Log4jLogger.java:299)
    at Main.main(Main.java:8)
QUIT
221 2.0.0 Bye
2019-03-03 13:13:49,204 main ERROR SmtpManager SMTP:848b9401aab8a35f62b00f0dbdf21fd4 Caught exception while sending e-mail notification.: com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first
 com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first

    at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2108)
    at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1609)
    at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1117)
    at javax.mail.Transport.send0(Transport.java:195)
    at javax.mail.Transport.send(Transport.java:124)
    at org.apache.logging.log4j.core.net.SmtpManager.sendMultipartMessage(SmtpManager.java:257)
    at org.apache.logging.log4j.core.net.SmtpManager.sendEvents(SmtpManager.java:172)
    at org.apache.logging.log4j.core.appender.SmtpAppender.append(SmtpAppender.java:181)
    at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
    at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:464)
    at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:448)
    at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:431)
    at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:406)
    at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63)
    at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:146)
    at org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2170)
    at org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2125)
    at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2108)
    at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2007)
    at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1866)
    at org.apache.logging.slf4j.Log4jLogger.error(Log4jLogger.java:299)
    at Main.main(Main.java:8)

2019-03-03 13:13:49,206 main ERROR An exception occurred processing Appender Mail org.apache.logging.log4j.LoggingException: Error occurred while sending email
    at org.apache.logging.log4j.core.net.SmtpManager.sendEvents(SmtpManager.java:175)
    at org.apache.logging.log4j.core.appender.SmtpAppender.append(SmtpAppender.java:181)
    at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
    at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:464)
    at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:448)
    at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:431)
    at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:406)
    at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63)
    at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:146)
    at org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2170)
    at org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2125)
    at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2108)
    at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2007)
    at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1866)
    at org.apache.logging.slf4j.Log4jLogger.error(Log4jLogger.java:299)
    at Main.main(Main.java:8)
Caused by: com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first

    at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2108)
    at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1609)
    at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1117)
    at javax.mail.Transport.send0(Transport.java:195)
    at javax.mail.Transport.send(Transport.java:124)
    at org.apache.logging.log4j.core.net.SmtpManager.sendMultipartMessage(SmtpManager.java:257)
    at org.apache.logging.log4j.core.net.SmtpManager.sendEvents(SmtpManager.java:172)
    ... 18 more

Exception in thread "main" org.apache.logging.log4j.core.appender.AppenderLoggingException: An exception occurred processing Appender Mail
    at org.apache.logging.log4j.core.appender.DefaultErrorHandler.error(DefaultErrorHandler.java:75)
    at org.apache.logging.log4j.core.config.AppenderControl.handleAppenderError(AppenderControl.java:165)
    at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:158)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
    at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:464)
    at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:448)
    at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:431)
    at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:406)
    at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63)
    at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:146)
    at org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2170)
    at org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2125)
    at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2108)
    at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2007)
    at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1866)
    at org.apache.logging.slf4j.Log4jLogger.error(Log4jLogger.java:299)
    at Main.main(Main.java:8)
Caused by: org.apache.logging.log4j.LoggingException: Error occurred while sending email
    at org.apache.logging.log4j.core.net.SmtpManager.sendEvents(SmtpManager.java:175)
    at org.apache.logging.log4j.core.appender.SmtpAppender.append(SmtpAppender.java:181)
    at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
    ... 16 more
Caused by: com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first

    at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2108)
    at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1609)
    at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1117)
    at javax.mail.Transport.send0(Transport.java:195)
    at javax.mail.Transport.send(Transport.java:124)
    at org.apache.logging.log4j.core.net.SmtpManager.sendMultipartMessage(SmtpManager.java:257)
    at org.apache.logging.log4j.core.net.SmtpManager.sendEvents(SmtpManager.java:172)
    ... 18 more

Насколько я понимаю программа может установить соединение с сервером, но тогда Must issue a STARTTLS command first это происходит. Может кто-нибудь объяснить мне, что это значит и как это исправить?

Когда я искал ошибку, я получил несколько сообщений с похожими проблемами, но не с log4j2, а с java.mail, и они мне не помогли.

Я пытался использовать smtpPort = "465" и smtpProtocol = "smtps", но в обоих случаях соединение было отклонено.

У меня больше нет новых идей, и я благодарен всем, кто мне помогает.