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SMTP email: mailbox unavailable. Server response: No such recipient

I've created a new mailbox for general support questions. When I try to send an email via SMTP, I get the following error:

The mailbox is not available. Server response: No such recipient

I am able to send an email via Outlook and SMTP when I send to another email on the same domain.

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6 answers


The great thing about SMTP is that it's easy to spoof a conversation. The terrible thing about SMTP is also that it's easy to spoof a conversation. What makes this different is that if you want to find out what is happening on an SMTP connection, you can simply "telnet mailhost 25" and start issuing SMTP commands, for example:



HELO example.com
MAIL FROM: <me@me.com>
RCPT TO: <him@him.com>
DATA
Subject: test message
From: Me <me@me.com>
To: Him <him@him.com>

test message
.
QUIT
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Is DNS configured correctly? You need an MX record indicating which host is handling incoming messages for that domain.



Btw, your post is missing some details like which server you are using etc. This makes it difficult to find the problem.

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If you are posting a complete SMTP session (or at least what your client is sending) the answer will probably pop out at you.

Or, if you are speaking SMTP correctly, you may be connecting to the wrong server. Is your client looking for a DNS MX record to find the correct SMTP host?

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Make sure the address is valid first. Also, make sure the From address is valid (this could be your problem). Finally, if they don't work, you should try to configure your SMTP server explicitly.

Without a little code example, the best advice I can think of.

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Does your company have multiple mail servers? Such a recipient cannot be returned if you have multiple servers and the account you just created has not been clicked on yet.

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I actually used Telnet to diagnose the problem (thanks to Paul Tomblin for reporting). I found out that our SMTP server uses GroupWise (we use Exchange as our primary email client). I had to set up a relay address to the GroupWise server.

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