I'm trying to use SMTPAppender to send a log message through gmail. I have added javax.mail:mailapi:1.4.3 as a depdendency. I also tried adding javax.activation:activation:1.1.1 with no success. If I change the host to xyz, it has no affect. This is my configuration file: <configuration debug="true"> <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> <encoder> <pattern> %-4relative [out] %-5level %logger - %msg%n </pattern> </encoder> </appender> <appender name="EMAIL" class="ch.qos.logback.classic.net.SMTPAppender"> <smtpHost>smtp.gmail.com</smtpHost> <smtpPort>465</smtpPort> <SSL>true</SSL> <username>somebody@gmail.com</username> <password>somepass</password> <to>someone@gmail.com</to> <from>somebody@gmail.com</from> <subject>Testing %logger{20} - %m</subject> <layout class="ch.qos.logback.classic.PatternLayout"> <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{1} - %msg%n</pattern> </layout> </appender> <root level="info"> <appender-ref ref="STDOUT" /> <appender-ref ref="EMAIL" /> </root> </configuration> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Console output 12:45:56,627 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender] 12:45:56,630 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [STDOUT] 12:45:56,644 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property 12:45:56,668 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.classic.net.SMTPAppender] 12:45:56,678 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [EMAIL] 12:45:56,714 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to INFO 12:45:56,714 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [STDOUT] to Logger[ROOT] 12:45:56,715 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [EMAIL] to Logger[ROOT] 12:45:56,715 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration. 180 [out] INFO SmtpTest - Hello World