Nic,

If it was posted on the Internet, it must be true! Don't you see the ads where you are? :-)

Seriously, when I get errors like this I like to trace the DNS "tree" -- amazing how often I find that there are "DNS traps" "in the wild"... because, truth be told, you could BOTH be right! (It's amazing to me how much people take DNS for granted... )

For example:
 - the TLD says example.com uses NS servers 1.1.1.1 & 1.1.1.2
- the NS service at 1.1.1.1 says that it truly is a DNS serer for example.com, and lists 1.1.1.3 & 1.1.1.4 as other NS servers... but not 1.1.1.2 - the NS service at 1.1.1.2 says that it truly is a DNS server for example.com, and lists 1.1.1.1 as the only other NS server - the NS service at 1.1.1.1 says the least-cost MX record for example.com is 2.2.2.1 - the NS service at 1.1.1.2 says the least-cost MX record for example.com is 2.2.2.1 - the NS service at 1.1.1.3 says the least-cost MX record for example.com is 2.2.2.4 - the NS service at 1.1.1.4 says the least-cost MX record for example.com is 2.2.2.16
 - The mailserver at 2.2.2.1 says u...@example.com is a local mailbox
- The mailserver at 2.2.2.4 says example.com is NOT a valid local domain and rejects ALL messages for example.com - The mailserver at 2.2.2.16 says u...@example.com is NOT a valid user, but accepts some OTHER messages for example.com

Now this is an extreme example, but I have found situations like this "for real" -- the issue is that people migrate from server to server & don't clean up the configurations behind them. (In the example above, the 2.2.2.16 server was used years ago, so simply doesn't know u...@example.com, and 2.2.2.4 is just an error).

The good news is that there are tools that can help you discover these kinds of issues: check out _*INTODNS.*__*COM*__* *_Along with *_MXTOOLBOX.COM_**, *its just one of those tools that I wouldn't want to live without (as a mail admin, at least)

Dan McAllister
IT4SOHO
QMT DNS/Mirror Admin

PS: Can you see why I was chosen to be the DNS Admin for this project? :-)
___
_On 9/5/2013 1:09 AM, Nicholas Chua wrote:
Hi,

But the specific error stated

Remote host said: 550-5.1.1 The email account that you tried to reach does not exist.


Regards
Nic


On 5 Sep, 2013, at 12:45 PM, "ChandranManikandan" <kand...@gmail.com <mailto:kand...@gmail.com>> wrote:

Hi Nic,
I have checked online to validate this email address is correct.


On Thu, Sep 5, 2013 at 12:21 PM, Nicholas Chua <nicholasc...@outlook.com <mailto:nicholasc...@outlook.com>> wrote:

    Hi,

    Make sure the receiver address is correct



    Regards
    Nic


    On 5 Sep, 2013, at 12:19 PM, "ChandranManikandan"
    <kand...@gmail.com <mailto:kand...@gmail.com>> wrote:

    Hi All,
    One of our user send email to their clients and other user get
    below bounce message and system administrator get the same
    bounce message. How to avoid this issue. This problem come very
    frequently. Please help me anyone.
    I mentioned below message which i got.

    Sender address is: s...@xxx.net <mailto:s...@xxx.net>

    Sender Domain is: mail.xxxx.net <http://mail.xxxx.net>
    Bounce message below.
    Hi. This is the qmail-send program at mail.xxxx.net
    <http://mail.xxxx.net>.
    I tried to deliver a bounce message to this address, but the
    bounce bounced!

    <a...@stellarsoftware.net <mailto:a...@stellarsoftware.net>>:
    User and password not set, continuing without authentication.
    74.125.25.26 does not like recipient.
    Remote host said: 550-5.1.1 The email account that you tried to
    reach does not exist. Please try
    550-5.1.1 double-checking the recipient's email address for typos or
    550-5.1.1 unnecessary spaces. Learn more at
    550 5.1.1
    http://support.google.com/mail/bin/answer.py?answer=6596
    dz4si19889772pbc.329 - gsmtp Giving up on 74.125.25.26.

    <aj...@rjtcompuquest.com <mailto:aj...@rjtcompuquest.com>>:
    User and password not set, continuing without authentication.
    74.125.25.26 does not like recipient.
    Remote host said: 550-5.1.1 The email account that you tried to
    reach does not exist. Please try
    550-5.1.1 double-checking the recipient's email address for typos or
    550-5.1.1 unnecessary spaces. Learn more at
    550 5.1.1
    http://support.google.com/mail/bin/answer.py?answer=6596
    cr3si19952184pbc.20 - gsmtp Giving up on 74.125.25.26.

    <a...@nihaki.com <mailto:a...@nihaki.com>>:
    User and password not set, continuing without authentication.
    207.5.72.155 does not like recipient.
    Remote host said: 550 5.1.1 <a...@nihaki.com
    <mailto:a...@nihaki.com>>: Recipient address rejected: User
    unknown in relay recipient table Giving up on 207.5.72.155.

    <al...@pegasyssoft.com <mailto:al...@pegasyssoft.com>>:
    User and password not set, continuing without authentication.
    198.57.229.105 does not like recipient.
    Remote host said: 550 No such person at this address"
    Giving up on 198.57.229.105.

    <a...@techstaremail.com <mailto:a...@techstaremail.com>>:
    User and password not set, continuing without authentication.
    208.65.144.2 does not like recipient.
    Remote host said: 553 Invalid recipient a...@techstaremail.com
    <mailto:a...@techstaremail.com> (Mode: normal) Giving up on
    208.65.144.2.

    <amru...@libsysinc.com <mailto:amru...@libsysinc.com>>:
    User and password not set, continuing without authentication.
    50.79.55.225 does not like recipient.
    Remote host said: 550 5.1.1 User unknown Giving up on 50.79.55.225.

    <aqee...@usmsystems.com <mailto:aqee...@usmsystems.com>>:
    User and password not set, continuing without authentication.
    174.79.187.234 does not like recipient.
    Remote host said: 550 5.1.1 User unknown Giving up on
    174.79.187.234.

    <auto_3645612571...@jobdiva.com
    <mailto:auto_3645612571...@jobdiva.com>>:
    User and password not set, continuing without authentication.
    64.18.6.10 does not like recipient.
    Remote host said: 550 No such user - psmtp Giving up on 64.18.6.10.

    <a...@realsoftech.com <mailto:a...@realsoftech.com>>:
    User and password not set, continuing without authentication.
    64.26.60.153 does not like recipient.
    Remote host said: 550 5.7.1 <a...@realsoftech.com
    <mailto:a...@realsoftech.com>>: Recipient address rejected:
    Invalid recipient Giving up on 64.26.60.153.

    <bhanifu...@adroitps.com <mailto:bhanifu...@adroitps.com>>:
    User and password not set, continuing without authentication.
    65.254.254.50 does not like recipient.
    Remote host said: 550 5.1.1 <bhanifu...@adroitps.com
    <mailto:bhanifu...@adroitps.com>> recipient rejected Giving up
    on 65.254.254.50.

    <cha...@secureapptech.com <mailto:cha...@secureapptech.com>>:
    User and password not set, continuing without authentication.
    <cha...@secureapptech.com <mailto:cha...@secureapptech.com>>
    63.250.193.253 failed after I sent the message.
    Remote host said: 554 delivery error: dd This user doesn't have
    a secureapptech.com <http://secureapptech.com> account
    (cha...@secureapptech.com <mailto:cha...@secureapptech.com>) [0]
    - mta1018.biz.mail.gq1.yahoo.com
    <http://mta1018.biz.mail.gq1.yahoo.com>

    <d...@itekcsi.com <mailto:d...@itekcsi.com>>:
    User and password not set, continuing without authentication.
    65.182.102.90 does not like recipient.
    Remote host said: 550 5.1.1 <d...@itekcsi.com
    <mailto:d...@itekcsi.com>>: Recipient address rejected:
    itekcsi.com <http://itekcsi.com> Giving up on 65.182.102.90.

    <d...@itscient.com <mailto:d...@itscient.com>>:
    User and password not set, continuing without authentication.
    207.45.187.34 does not like recipient.
    Remote host said: 550 No Such User Here. Please email your
    queries to br...@itscient.com <mailto:br...@itscient.com>."
    Giving up on 207.45.187.34.

    <dil...@vintech.com <mailto:dil...@vintech.com>>:
    User and password not set, continuing without authentication.
    173.164.132.210 does not like recipient.
    Remote host said: 550 5.1.1 <dil...@vintech.com
    <mailto:dil...@vintech.com>> User unknown; rejecting Giving up
    on 173.164.132.210.

    <businessexe...@valconusa.com
    <mailto:businessexe...@valconusa.com>>:
    User and password not set, continuing without authentication.
    216.69.186.201 does not like recipient.
    Remote host said: 550 #5.1.0 Address rejected.
    Giving up on 216.69.186.201.

    <din...@compusoft-is.com <mailto:din...@compusoft-is.com>>:
    User and password not set, continuing without authentication.
    216.69.186.201 does not like recipient.
    Remote host said: 550 #5.1.0 Address rejected.
    Giving up on 216.69.186.201.

    --- Below this line is the original bounce.

    Return-Path: <>
    Received: (qmail 31267 invoked by uid 89); 5 Sep 2013 04:00:04 -0000
    Received: by simscan 1.4.0 ppid: 31045, pid: 31249, t: 0.8400s
             scanners: attach: 1.4.0 clamav: 0.97.8/m:54/d:17807
    spam: 3.3.2
    X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on
    mail.xxxx.net <http://mail.xxxx.net>
    X-Spam-Level: ****
    X-Spam-Status: No, score=4.4 required=10.0
    tests=BAYES_50,EMPTY_MESSAGE,
    HTML_MESSAGE,MISSING_MID,RDNS_NONE autolearn=no version=3.3.2
    Received: from unknown (HELO jobdivabk.com
    <http://jobdivabk.com>) (66.111.12.234)
      by mail.xxxx.net <http://mail.xxxx.net> with SMTP; 5 Sep 2013
    04:00:03 -0000
    Received-SPF: pass (mail.xxxx.net <http://mail.xxxx.net>: SPF
    record at jobdivabk.com <http://jobdivabk.com> designates
    66.111.12.234 as permitted sender)
    Received: from  ([10.10.129.14])
    by jobdivabk.com <http://jobdivabk.com> (L-Soft HDMail 2.1);
    X-VirtualServerGroup: Default
    X-MailingID: 00000::00000::00000::00000::00000::13294602
    X-SMHeaderMap: mid="X-MailingID"
    X-Mailer: L-Soft HDMail 2.1
    X-Destination-ID: s...@xxxx.net <mailto:s...@xxxx.net>
    X-SMFBL: c2l2YUBwYW5hc2lhZ3JvdXAubmV0
    Content-Type: multipart/report; report-type=delivery-status;
    boundary="41AB039EBB4.1102407491/mailer-strongmail"
    MIME-Version: 1.0
    Subject: "Undelivered Mail Returned to Sender"
    Date: Wed, 04 Sep 2013 23:59:41 -0400
    To: s...@xxxx.net <mailto:s...@xxxx.net>
    From: adm...@jobdiva.com <mailto:adm...@jobdiva.com>

    --41AB039EBB4.1102407491/mailer-strongmail
    Content-Description: Notification
    Content-Type: text/plain

    "Did not reach the following recipient(s):"
    faisalkhan.websph...@gmail.com
    <mailto:faisalkhan.websph...@gmail.com> on Wed, 04 Sep 2013
    23:59:41 -0400 [Message Expired]

    --41AB039EBB4.1102407491/mailer-strongmail
    Content-type: message/delivery-status

    Reporting-MTA: dns; jobdivabk.com <http://jobdivabk.com>
    Arrival-Date: Wed, 04 Sep 2013 12:27:02 -0400

    Final-Recipient: RFC822; faisalkhan.websph...@gmail.com
    <mailto:faisalkhan.websph...@gmail.com>
    Action: failed
    Status: 5.4.7
    Diagnostic-Code: smtp; [Message Expired]
    Last-Attempt-Date: Wed, 04 Sep 2013 23:59:41 -0400



    --41AB039EBB4.1102407491/mailer-strongmail
    Content-Description: Undelivered Message
    Content-Type: message/rfc822

    Date: Wed, 4 Sep 2013 11:39:07 -0400 (EDT)
    From: Siva Kumar <s...@xxxx.net <mailto:s...@xxxx.net>>
    To: faisalkhan.websph...@gmail.com
    <mailto:faisalkhan.websph...@gmail.com>
    Message-ID: <18446833.536691378309147581.JavaMail.oracle@batch_big1>
    Subject: Websphere Message Broker Consultant needed in MA
    MIME-Version: 1.0
    Content-Type: multipart/mixed;
    boundary="----=_Part_53850_26605867.1378309147580"

    -



-- */Thanks & Best Regards,
    Manikandan.C
    /*




--
*/Thanks & Best Regards,
Manikandan.C
/*


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