Sender address rejected error while sending emails

Question

I am developing a ruby on rails application which sends out emails. When I try to send emails from mailer is says 553 : Sender address rejected: not owned by user X. But I try to send an email manually using Net::SMTP it goes well. I am kind of stuck for the release. Please help!!!

Answer 1

Your mail server is configured to check if the client is allowed to send mail with the supplied sender address. Your application does not authenticate itself as a user who is allowed to use the email address ("x" in your question) as a sender.

See this forum post. Likely when you try it manually you are logging in under a different name than your application.