send.mail(from = "my.mail@gmail.com",
 to = "my.mail@gmail.com",
 subject = "Subject of the email",
      body = "Body of the email",
      smtp = list(host.name = "smtp.gmail.com",
      port = 465, user.name = "my.mail@gmail.com",
      passwd = "my.password", ssl = TRUE),
      authenticate = TRUE,
      send = TRUE)

org.apache.commons.mail.EmailException: Sending the email to the following
server failed : smtp.gmail.com:465
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1410)
at org.apache.commons.mail.Email.send(Email.java:1437)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.NULL
java:597)
at RJavaTools.invokeMethod(RJavaTools.java:386)
Caused by: 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 l135sm1714011oib.8 - gsmtp

at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:892)
at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:814)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:728)
at javax.mail.Service.connect(Service.java:386)
at javax.mail.Service.connect(Service.java:245)
at javax.mail.Service.connect(Service.java:194)
at javax.mail.Transport.send0(Transport.java:253)
at javax.mail.Transport.send(Transport.java:124)
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1400)
... 6 more