How can I get the email by running my ruby application?

view full story

http://stackoverflow.com – I run application which will execute and send a mail to the user. I'm using CentOS machine. But I'm getting the following error, status=bounced (host mailfwd[] said: 554 5.7.1 <[email protected]>: Relay access denied (in reply to RCPT TO command)) What is this? how can I fix and get the email? (HowTos)