Apache commons mail Exception..Recipient address rejected: User unknown in virtual alias table

Question

I have two emails of my own domain. One is configured in the domain and other is configured in gmail (admin.google.com).

My code

    HtmlEmail htmlEmail = new HtmlEmail();
    htmlEmail.setHostName("mydomain.com");
    htmlEmail.setSmtpPort(587);
    htmlEmail.setAuthenticator(new DefaultAuthenticator(
            "enquiry@mydomain.com", "password"));


        htmlEmail.setFrom("enquiry@mydomain.com", " Enquiry");
        htmlEmail.setSubject("New Enquiry");
        htmlEmail.setHtmlMsg("My message");
        htmlEmail.addTo("info@mydomain.com");

        htmlEmail.send();

When I send mail from the domain configured email(enquiry@mydomain.com) to gmail configured email(info@mydomain.com) it shows the following error:

org.apache.commons.mail.EmailException: Sending the email to the following server failed : mydomain.com:587
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1421)
at org.apache.commons.mail.Email.send(Email.java:1448)
at com.myproject.test.HomeController.sendEmail(HomeController.java:153) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) at org.springframework.web.servlet.FrameworkServle t.processRequest(FrameworkServlet.java:882) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) at javax.servlet.http.HttpServlet.service(HttpServlet.java:644)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) at org.apache.catali na.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1086) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:659) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:147) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:279) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Unknown Source) Caused by: javax.mail.SendFailedException: Invalid Addresses; nested exception is: com.sun.mail.smtp.SMTPAddressFailedException: 550 5.1.1 : Recipient address rejected: User unknown in virtual alias table at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1949) at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1195) at javax.mail.Transport.send0(Transport.java:254) at javax.mail.Transport.send(Transport.java:124) at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1411) ... 39 more Caused by: com.sun.mail.smtp.SMTPAddressFailedException: 550 5.1.1 : Recipient address rejected: User unknown in virtual alias table at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1802)

Answer 1

The root-cause seems to be Recipient address rejected: User unknown in virtual alias table , which indicates that the SMTP-server that you are sending to rejects the email because it does not know the email-address that you specified.

So either the email-address is incorrect or the SMTP-server needs to be configured properly to accept this email-address that you specify in the to and sender fields.