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    <p>Achieving this <strong>reliably</strong> is not trivial. The protocol specs for SMTP in RFC 821 specifies a number of return codes. Notably 550 is what an SMTP server <em>should</em> return when attempting to send an email to a nonexistent address. I say <em>should</em> because most public-facing SMTP servers won't do this - they either quietly accepts the message and then drops it or, if they are a little more good-mannered, accepts the message but sends a "delivery failed" notice back to the sender ("from" address). Public services like MSN and Gmail will also blacklist senders if they send enough emails to non-existing addresses to prevent spam.</p> <p>The reason for this is to prevent email-fishing and spamming.</p> <p>So what you can do is to </p> <ol> <li>Check for <code>SendFailedException</code> in your code. This will only work for servers that follow the SMTP specifications and actually send an error code back. Like I said, very few public servers actually do this.</li> <li>Set up a proper mailbox for the address you use as sender and monitor that inbox for delivery failed notices. Note thought that these need not follow any common pattern, which is why this is non-trivial.</li> <li>For the email servers that doesn't give any notice, you really have no way of knowing.</li> </ol> <p>This is one of the reasons why companies buy mass emailing services from dedicated providers, since they have all these things already built to measure bounce-rate etc. But even with those, it's never going to be 100% accurate.</p>
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    1. POHow Can achieve delivery failure notice mail using Spring JavMail?
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    1. COThanks you very much .......very clear explanation....I am going to try with the tips u have given.....
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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