JavaMail with MS Exchange: No authentication mechansims supported by both server and client
I've been trying for days now to send mail from Grails application and unsuccessfully. I'm using: grails 1.3.7 mail 1.0 plugin spring-security-core 1.2.6 plugin tomcat 7.0.23 Specifficaly I'm trying to send mail with Exchange from application deployed on Tomcat server trought port 25 with no authentication, no SSL. I've tried to send message with telnet from the VMWare virtual machine on which the app is deployed and it got trough. This is my class for sending mails: public boolean sendMessage(String to, String msgSubject, String msgText) { String host = "mail.mydomain.com"; String username =