WSO2 email verification error (cannot verify registration)

`<adapterConfig type="email">
        <!-- Comment mail.smtp.user and mail.smtp.password properties to support connecting SMTP servers which use trust
        based authentication rather username/password authentication -->
        <property key="mail.smtp.from">myemail@gmail.com</property>
        <property key="mail.smtp.user">myemail</property>
        <property key="mail.smtp.password">mypassword</property>
        <property key="mail.smtp.host">smtp.gmail.com</property>
        <property key="mail.smtp.port">587</property>
        <property key="mail.smtp.starttls.enable">true</property>
        <property key="mail.smtp.auth">true</property>
        <!-- Thread Pool Related Properties -->
        <property key="minThread">8</property>
        <property key="maxThread">100</property>
        <property key="keepAliveTimeInMillis">20000</property>
        <property key="jobQueueSize">10000</property>
    </adapterConfig>`

this return error

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[2020-02-27 10:09:31,044] [ae5eb5fa-f5c4-43fc-a9ad-1ab0ed706426] ERROR {org.wso2.carbon.event.output.adapter.email.EmailEventAdapter} - Event dropped at Output Adapter 'EmailPublisher' for tenant id '-1234', Error in message format, 535-5.7.8 Username and Password not accepted. Learn more at 535 5.7.8 https://support.google.com/mail/?p=BadCredentials 13sm4390005pfi.78 - gsmtp javax.mail.AuthenticationFailedException: 535-5.7.8 Username and Password not accepted. Learn more at 535 5.7.8 https://support.google.com/mail/?p=BadCredentials 13sm4390005pfi.78 - gsmtp at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:965) at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:876) at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:780) at javax.mail.Service.connect(Service.java:388) at javax.mail.Service.connect(Service.java:246) at javax.mail.Service.connect(Service.java:195) at javax.mail.Transport.send0(Transport.java:254) at javax.mail.Transport.send(Transport.java:124) at org.wso2.carbon.event.output.adapter.email.EmailEventAdapter$EmailSender.run(EmailEventAdapter.java:306) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)

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