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Java Program Sends out Email to Bad Email Address -- No 'mailer daemon' Response Received

I have written a Java program using the Java Mail functionality.  It sends out a set of emails to various email addresses.

I intentionally tested by putting in a fictitious email address, expecting to receive a response from the mailer daemon telling me that the email could not be delivered; but there was no such response.

I would not have thought that in this regard there would be a distinction between an email sent by Java code and an email sent, say, from my Outlook application.  Yet, there clearly is.

Can someone explain that and, hopefully, give me a way to insure that the mailer daemon will send me a response in the event of a bad address?

Thank you.
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david_m_jacobson
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david_m_jacobson
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Dave BaldwinFixer of ProblemsCommented:
I suspect you're not going to get that because the message saying that email is bad is not part of the sending process.  That is especially true if the domain exists because the NDR (Non Delivery Report) comes from the remote server, not the local one.  The only way you would get the NDR is to send from a valid email account so that the message would be returned there.
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david_m_jacobsonAuthor Commented:
Pity.  OK.  Thanks for the response.
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david_m_jacobsonAuthor Commented:
I need to correct what I said here.

I just found that, indeed, the mailer daemon WAS sending a response.  Gmail had put that email into the Spam folder with a warning that it appeared that that email was a response to an email that I hadn't sent.

Very interesting, and very clever of Gmail to have marked it so.

In any case, I was able to indicate that it was not Spam and thereafter, such an email from the mailer daemon IS getting through to me.

Thank you again for your interest in this issue.
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