Sending failed due to invalid destination address - HELP

Question

javax.mail.SendFailedException: Sending failed;
nested exception is:
class javax.mail.SendFailedException: Invalid Addresses;
nested exception is:
class javax.mail.SendFailedException: 550 5.7.1 Unable to relay for shoi
[email protected]
at javax.mail.Transport.send0(Transport.java:218)
at javax.mail.Transport.send(Transport.java:80)
at msg.main(msg.java:70)
javax.mail.SendFailedException: Invalid Addresses;
nested exception is:
class javax.mail.SendFailedException: 550 5.7.1 Unable to relay for shoi
[email protected]
at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:848)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:323)
at javax.mail.Transport.send0(Transport.java:163)
at javax.mail.Transport.send(Transport.java:80)
at msg.main(msg.java:70)
***** Though i have given the recipent address correct, still i am getting this invalid address and sending failed exception, i really dont understand what is happening, b'cause the program is perfectly allriight, the only problem i think what could be is, the mail server should be having the problem, i just want to know how to rectify it and what is the solution.

Answer 1

the 550 error code usually means that the mail server you connected with didn't want to relay your message (which is an option they often don't allow). lot of mail servers don't want you to use your own software so that you have to use their software (usually a browser account) so that they can show you all sorts of advertisements (I could be wrong about this, though). The SMTP will allow them to basically cut you off from using it unless you're actually logged onto the server itself (which I have yet to find a way, as its not part of SMTP -- it's part of the POP commands, but they can disable POP altogether).
If you want to keep developing in spite of this, though, try setting your own PC up to be a SMTP server with your own software or do a search for some small software called "agsmail" which is free. If you want to learn more about the SMTP commands (which those Java mail libraries are probably using behind the scenes) take a look at the RFC's for 'em.... here's the basic one for SMTP: http://www.cis.ohio-state.edu/cgi-bin/rfc/rfc2821.html
ref: a friend from community discussion