I tried to send some email using the Net::SMTP object and got the following 
error

Net::ProtoSyntaxError: 500 500 5.5.1 Command unrecognized: "AUTH CRAM-MD5"

then I changed to use the :plain auth method and still got another error

Net::ProtoSyntaxError: 503 503 5.3.3 AUTH mechanism PLAIN not available


What else can I do?

Regards